I disagree with the premise that Joe Root or any modern great player would struggle in old era (circa 1930s-1940s). When I say modern era, I am basically referring to players from 1970s and later because that is when cricket sort of took off as an athletic sport and we saw a rise in genuine fast bowlers and improved fielding standards.
So Joe Root, Kohli, Tendulkar, Sir Viv Richards, Greg Chappell etc. would not struggle on those sticky uncovered wickets because the vast majority of the bowlers bowled medium pace and fielding standards were low. A lot of boundaries that Bradman and Hobbs hit would be cut off today.
There is a such a big gulf in overall quality and competitiveness of modern cricket (post 1970s) compared what it was pre-WWII that modern great players will neutralize factors like uncovered pitches, small bats etc.
This is not a critique of the players who played in that era because they were a product of their time. As the cricket economy grew, more teams got involved, the level of competition increased and the paychecks got bigger. It changed the dynamics of how the sport was played.
A lot of players in the pre-WWII era had full-time jobs and their skills cannot be compared to full-time cricketers.
These cross-era comparisons are pointless anyway because it inevitably results in downplaying the achievements and success of the players of the old era who deserve a lot of respect and recognition for what they achieved in their time and helped the game evolve.
Ultimately, the best way to judge a player is to compare him to the other players of his time. It is the most reliable measure.
first of all why use 1970 as a cut off point for cricket? that makes zero sense , many crickets who debuted in 60s in the supposed Amateus era not only played on the international level post 1970 but succeded too
Geoffrey Boycott was born in 1940 , so assuming he was atleast playing and fully trained by 18-19 , literally all his training and technique and style comes under mid-late 50s English cricket but that did not stop him from averaging 55.97 in the 70s , heck a 40+ Boycott played 14 tests in 80s and still had 4 hundreds with a 41 average and was even considered to return at 44 year old after his ban.
thats not the only example , the great Clive Lloyd even , who was 22 when he debuted in 1966 , so he was also produced via amateus era cricket , and he was averaging 45.72 with 3475 runs in the 1970s and 2881 runs at 52.38 in the 80s , which again shows cricket standard didn't change much from early 60s , straight to 80s.
heck you can even take Sir Garfield sobers , debuted in 1954 but averaged 50+ in early 70s with 1000+ runs , also had a legendary 254 against Dennis Lillee aka the best bowler of 70s.
either way , I absolutely disagree with your stance on them being able to nullify sticky pitches and wet dogs simply because they are accustomed to playing faster bowling , a person who can move a ball a lot at 120s-130s is equally as dangerous as someone operating in 150s , Ollie Robinson is threatning with 75-80 mph pace for a reason , if you can move it then you can be threatning and considering there won't be any protective gear would even be more dangerous.
I don't agree that things have changed much for a lot of sports , Tyson Fury as a boxer is in a era where there is a lot more medical knowledge and investment into boxing but would anyone argue Fury can stomp on Mohammad Ali though? ofcourse not.
Like I went against the idea of 70s being a cut off point , even World War II being one of the cutt off points is quite hard , as crickets came back from world war II and still showed success , look at Len Hutton whose career spanned 30s , 40s and the 50s , he averaged 67 with 1000+ runs in 30s , then came back and averaged 51+ in 40s with 2443 runs and then 56.8 in the 50s with 3183 runs , so by that we can conclude that the game didn't suddently jump levels in 80s either , so what is the cut off point then?
either way , I could respect your stance that the older game was less quality and see where you are coming from but I completely disagree with the job point , Cricket wasn't played as frequently back then , there was one format , few teams e.t.c. and thus having a source lf income on the side does not effect their ability in the sport
either way , I do agree that comparasion threads accross generations are pointless as in the end the favour is gonna go to the one that was seen more frequently rather then the one whose watchers are mostly dead and thus it would lead to inevitable underestimation of pre colorized TV Cricket.
in the regard of being ahead of their contomprary , Hobbs averaged 58 compared to the next highest scorer at 42 from his debut until sutcliffe's debut who was able to somewhat challenge Hobbs but then fell after Hobbs's retirement showing everyone how much of his success he owed to Hobbs.
I see your stance , but I just can't agree with it for plethora of reasons , some I mentioned and some you can guess.