Even in 2011 rackets that were over 20 years old weren't significantly different to be a problem to play with. You have to go back to the mid 1970s really to be limited to frames that were too small/heavy/flexy to work adequately. Consider a Prince Graphite II (1992): it's essentially PS97 spec (97sqi, 340g strung, open string-bed, 22mm beam). Indeed the oversize version was probably only 103sqi, so it's a Pro-Staff X equivalent! Yes, modern frames are lighter, and have been cleverly engineered to feel solid even at those lower weights, but I read a lot of 'you need to add lead here and a leather grip', so you end up about around the same spec. The sweetspots are pretty much the same size. Even my MAX 150G (68sqi) is no problem if you commit.
There's no question that if you start your session with a modern tweener, you will definitely struggle with an old-school 360g racket. But if you start your session with the latter, then move to a tweener, they feel terribly weak and uncontrollable. It really is just a matter of what you want to get used to.
P.S. my players: MAX 200G, MAX 300i