150+ kph bowlers in pre-helmet era and low protection era would have killed too many big folks. So those figures attributed to "ancient" bowlers is just a hype. Have you seen footages of fast bowling of the early days of cricket? The word "tearaway" fast bowler is only relative.
A 125kph delivery hitting your skull without protection is not a joke - it can kill you or seriously wound you. The ball that killed Phil Hughes (armed with a modern helmet) was not 150kph. It was much slower. Now imagine what 150kph can do to you, if you have to face it on a regular basis without helmets. What happens to less skilled FC batsmen of Bradman's era who have to face these type of monster 150kph deliveries? During the WSC bowlers had so skilled and evolved that playing without serious body protection became a life or death matter, which is when modern helmets and protection was introduced.
Modern pace bowling - 140+ speeds appeared only in the 50s and 60s, and reached its peak in the 70s and 80s where speeds of 155-160kph was regularly breached by a few elite pacemen.
You are still winging it. Every historical assessment of Larwood holds that he was very fast by any standard. Experts have gone over footage and assessed him at 150 + The point is not how fas he was exactly, but that the 125 figure you tried to convince us of is pulled out of a hat. The idea that no one bowled 140+ before the 50's is just a lie, plain and simple.
In fact it would be incredibly strange if in an era spanning 20 years there were not a few tearways on offer. Speed is not coached or trained, it requires a certain kind of body. You can't turn Umar Gul into a Shoaib Akthar, not matter how much you train him.
Similarly, what makes for a good batsman, things like hand-eye coordination, concentration and patience, are traits players are born with, not skills that they acquire. No matter how 'hungry' they are. And the human body, what it is capable of has not and cannot have 'evolved' in 60 years. That is not the time scale of evolution.
If there are Mark Woods around in today's population of Englishmen, then there were Mark Woods around 60 years ago, likely more of them.
Your belief that everything is better and faster and stronger today is, I venture, a conviction of ideology, and a common one at that, namely that modernity and capitalism must always produce progress, that everything is always getting better, that more competition will always yield better results, and that the only barrier to success, is 'will,' 'determination,' 'hunger' etc. Hence, those who do not succeed have only themselves to blame.
Unfortunately, even with steroids and other performance enhancing drugs, a biological organism such as the human body can only be pushed so much. Sprinters have been running the 100 metre faster over the decades, but the improvements are infinitesimally minute. Since 1891, 1.3 seconds/ 10 have been shaved off the world record.
Knowing this, what is really remarkable about your line of argument is the magnitude of the purported 'development' which English and Australian peoples have apparently enjoyed in the last 60 years.
The difference between a great batsman today and a mediocre one is relatively small, statistically speaking. Ave 50 is great, 40 mediocre, 30 is poor. Bradman didn't just average 10 or 20 more than the rest, he averaged 40-50 more. He wasn't just twice as good, but logarithmically better. If he were to be little better than a 50-something player today, then the very best players of his time, would have been no better than a bowling allrounder like Philander today; the mere mediocre ones would have had to be McGraths with the bat.
In other words, if you argue that Bradman was merely as good as a Ponting, then you also stand for the proposition that in an era spanning 20 years, England and Australia could otherwise not produce a batsman better than Philander. And that is a ludicrously unlikely proposition. Batsmen who can average 35-40 in contemporary Test cricket are a dime a dozen in every country. There is no reason to believe it was any different in Bradman's time.