I didn't miss the /s, but I feared others might think different ;)
From what I've read, the decisions to make Buran look externally like STS orbiter was a political one, and the engineers at MiG OKB weren't happy about it - they have been working on a bunch of space planes for some time, including the infamous suborbital fighter. However the similarity was found to have political benefits in the weird opposite of kremlinology and the decision stood.
Not having USAF's annoying requirements though, they were able to design a better system anyway. (Pre-USAF involvement STS was also better, but congress cost cutting made a necessity of begging DoD for funds)
Essentially, the Buran orbiter had different function, and thus different forces on its form.
US' STS shape was ultimately dictated by its cross range requirements combined with cargo capacity. Explicit case of function leading to specific form.
Buran didn't require the same huge cargo capacity in the orbiter, because Soviets had already tested and verified self-assembly of space station in orbit from multiple launched modules (technology that they would later employ in ISS). For huge capacity it had Energia, which once proven could be also launched on Polar orbits (the specific requirements from USAF for STS involved heavy cargo on polar orbits from Vandenberg).
This meant that Buran orbiter had wider design space to explore, and previous experiments in crewed reusable spacecraft were centered around lifting body shape, to extent much higher than STS was. However, the command to make it look like US STS came pretty early in the project, in addition to general lack of documents, so we don't really know how they would go.
I wish I was more diligent in noting back then, but essentially I went on a long walk on google, encyclopedia astronautica, checking russian pages with google translate etc. trying to read as much about the project - at the time it was still running we had more information published in Poland about Shuttle (including accurate drawings and system descriptions) than about Buran, and thus I was always left fascinated about this space plane that, compared to STS, I had only a blurry photo and maybe A4 page of description.
> 27. Alternative projects considered at the stages of the preliminary design and preliminary design: attempts to create OK "Buran" on the basis of OK "Spiral" - what was proposed (options and technical solutions) and what was accepted, what was not accepted, how and why.
> Orbital vehicle "Buran" in landing configuration
> Answer: We (NPO Molniya) worked on an alternative variant in a guise that mimics that of the Spiral orbital plane, but General Designer Glushko considered that by that time there were few materials that would confirm and guarantee success at a time when Shuttle flights proved that the Shuttle-like configuration works successfully and there is less risk when choosing a configuration, therefore, despite the larger useful volume of the Spiral configuration, it was decided to carry out the Buran in a configuration similar to the Shuttle configuration. Although the absence of sustainer engines on the Buran noticeably changed the centering, the position of the wings, the configuration of the influx, and a number of other differences.
> 28. Was the copying of "Space Shuttle" in a larger or smaller volume during the creation of Buran deliberate or were there "directive instructions"?
> Answer: Copying, as indicated in the previous answer, was, of course, completely conscious and justified in the process of those design developments that were carried out and during which, as already indicated above, many changes were made to both the configuration and the design. The main political requirement was to ensure that the dimensions of the payload compartment were the same as the payload compartment of the Shuttle.
> Shuttle flights proved that the Shuttle-like configuration works successfully and there is less risk when choosing a configuration
Classic Soviet risk-averse behavior. See also: copying every single detail from the B-29 because they knew it worked and it would be their heads (perhaps literally) if the Tu-4 didn't. They did the same thing with Joe-1, their first atomic bomb test. Do what you know works so you can go home at the end of the day. Innovation is a luxury.
This is what happens when employees fear management. Lessons to be learned.
I guess I was wrong on that part. Interesting that Spiral had greater capacity, I thought the opposite based in some of the sketches - possibly I mixed up sketches of another MiG space plane.
Wish someone manages to one day do a definitive history translated into English
From what I've read, the decisions to make Buran look externally like STS orbiter was a political one, and the engineers at MiG OKB weren't happy about it - they have been working on a bunch of space planes for some time, including the infamous suborbital fighter. However the similarity was found to have political benefits in the weird opposite of kremlinology and the decision stood.
Not having USAF's annoying requirements though, they were able to design a better system anyway. (Pre-USAF involvement STS was also better, but congress cost cutting made a necessity of begging DoD for funds)