Sorry, that's annoying
I think certain allowances need to be made. Aldo was very keen on Gerson for instance but I discarded him on the basis he wouldn't keep up with the pace of the game today. No, not just the effect of his chain-smoking on running, stamina, etc. The pace the game is played at has changed quite radically, the space and time available to operate in is a fraction of what it used to be.
Now, someone who had the attributes to keep up with that I have no problem with (e.g. Rivelino). Surely, you have to assume they are getting equivalent fitness training regimes, etc. and that they learn the ins and outs of modern balls (otherwise Puskas would have spent all game ballooning it). But I would only disqualify players whose
style indicates they wouldn't make the transition even if you assumed their fitness levels and technological advances have been "upgraded".
I know that is hard to gage and everyone will do it differently but if we are going to go down the line that old-school players didn't have the equipment, the fitness, etc. we may as well not run an all-time fantasy game because it is completely pointless.