Mike -
you're suggesting that technology and psychology go hand in hand; that advances in the former are mirrored by an obsession with the latter; that, just as today's players 'need' a 460 cc driver (whereas 190 cc used to serve for decades) so too do modern tour pros 'need' a team of physical & mental health professionals and elaborate pre-shot routines (whereas they used to get by on nothing more than bourbon & bile); and that as course lengths have become irrelevant (with ever increasing distance gains) the pros have turned their attention inwards, to the space between their ears, as the 'driver' of better golf, lower scores, and an advantage over the field.
I think you're on to something: those old pros sure played quickly & well with that old equipment, straw fedoras, 'teams' of one, some late nights at the bar, and no other 'thoughts' than winning every single time out.