Possibly Because many of the OG Builders who did those things, have, like Roger Hayes said, gotten 20 years older and Gotten Over those "things', as you called them.? Possibly because aftermarket support for many of the parts needed to reach that level of detail has faded? Possibly because the population of Modelers willing (and able) to do that level of work gotten smaller? Possibly, because the Hobby has changed? Maybe it is just Age? There are any numbers of reasons.
Welcome Back to the Board. Perhaps you can share some of your favorite methods of working to that level of detail. I know I can't do those things, (although I am learning)so I look forward to having you show me some "Tips & Tricks".
I know that Bill Geary, Charles Rowley, Terry Jesse, & Tim Boyd, amongst many others post builds and tips here all the time.
My Thanks, in Advance.