I think I saw that Scientists got Science skills in MT. I am sure I recall being able to get robotics, and sensors and such.
I solve the "perceived problem" by not inspecting the setting too closely, and just tell stories.
As to your point:
And it's easily fixed, either by tweaking UWPs yourself or using a better model to produce them
Yet you also say, "you need a consistent backdrop."
Except that the "Consistent Backdrop" is what you / others want to change, via "tweak" or "better model".
Which is, I think the crux / point of argument for those who don't want it changed, by either method.
The setting as is, it might be unrealistic, but its not changing when someone comes along with a "fix", which may or may not be applicable to everyone / anyone in specific. Doing otherwise results in more work, and effort for the referee to keep track.
Again, I think this falls back into who designed it, and approves it as canon. When GDW makes those kinds of changes, and makes them Official, people accept the changes, stick with what they have, or abandon it, as a game.
I know that some have added in new sectors to the setting, and got them "approved" via license, or emailing Marc for permission / review.
But I will always feel, if I want to change it, I change it for me, not to even attempt anything on the order of: "Oh, this is so much better, more realistic, let's make everyone do it."
That's the point where I will resist, actively.