To me the high scorers are just the evolution of the game, it is suppose to happen with better pitches( -unlike to that of 80's and 90's where ball can deviate 180 degrees after pitching.) fast and smoother out fields, the batting technique and batsmen having more confidence on their hitting ability owing to the specialized nets/practices and training, same thing can be said about the fielding standards which have evolved a long way from the early days.
The batsmen ability and confidence can be easily seen these days when teams really bank on casing anything under 330
Even in 90's batsmen with confidence and hitting ability (Like Sanath, Afridi, Gilchrist) were having strike rate of 90+ and during those times there were no big bats. It’s just that there have been increase in such kind of a batsmen now. And there are proper batsmen down the order as well which has caused the hike in the scores.
Bowling has not evolved ever since or even worse the standards have dipped massively, when I last checked there was only one fast bowler in top 10 in T20I bowler's ranking. This is more even in ODIs but if you go down the ranking you will find more and more spinners, which is kind of odd as many teams do not go with more than one spinner in their lineup.
If we see there are no 150 kmph+ bowlers around baring Stack, I was watching an England match where commentators described Mark Wood as a really fast bowler and he never crosses 150 Kmph mark.
Adding to this there are no quality seam bowlers. I can understand why commentators will never address the issue of depleting bowling ability around the world.
Yes big bats added to that, but actually there were not many players using 45 mm+ edge’s bats . Its more down to the bowlers who are happily giving away 8 or 9 runs per over, earlier that could have caused a bowler his career, but it is Okay now.
Good bowlers are still getting wickets and keeping the run rate down, even on seaming/swinging conditions we have seen batsmen struggling, which clearly describe if the bowler has the ability to move the ball he can get the wickets and restrict huge scores.
I believe the huge scores are due to lack of good bowlers around the world.
The playing conditions will always improve from bats, balls, wickets, protection, grounds. It is the player who needs to improve along, seems like fielders and batsmen are way ahead of the bowlers now.