Good post, NamRanger.
I have a collection of older racquets and I can hit with them just fine compared to my new racquets. I stayed true to the prostaff 85 for quite some time before bumping it up an extra five square inches.
I can even hit with plenty of spin using a full bed of old synthetic gut (with a racquet from the 90s). I don't hit often with full natural gut because I am a frequent string breaker (I usually use a poly hybrid). I feel confident that the pros today would be able to generate significant depth, pace, and spin even if they were using "ancient technology" from the 90s.