Personal Opinion on this is that the 'general' standard of fielding in all pro's has increased. You still have the outstanding fielders of all generations that would if you put them all into one single generation look amazing. I don't personally believe there is the bowling stock there was of yesteryear for various reasons. I think the general standard of batting has improved but again, the greats of each era would be stand out any era. Now a days there are a lot more over inflated averages due to boundaries, bats, helmets (which would have made a big difference to the WI attack for instance).
I think one of you said about the fact Test matches are not really played enough, I agree.. HOwever I'd also say they don't actually 'test' the players anymore. When you factor in drinks breaks, unsheduled drinks breaks, gloves changing, toilet stops, slow over rates etc etc.. I think they need to re-dress this by making boundaries bigger again, and literally go back to the minimum stops they 'used' to have and force batsmen to bat for 2 hours without more than a cup of drink.. Testing their skills, mental fitness and fitness! Same with bowlers going off for a quick change of whites, rub down.. ice down etc.. No.. Bowl your overs and then stand for 2 hours in your sweaty kit WITHOUT drinks after every over!
I'd say overall though there are bits that are better now and there are things that are worse. TBH, I think you can look to the lower levels for all your answers as although the skill levels are lower it's a pretty accurate reflection.