Some may enjoy a supermarket game where clicking here or there is not going to make much difference at the end. Giving the players more points without any rework of the masteries is only going to turn the game into a max-all fest and make all end-game builds alike and kill what remains of the necessary thinking/planning/testing/etc that made the game exciting and challenging.

The skill trees are not designed in my opinion for more than 200 total skill points at most.

I think that keeping the same skill points gain progression is going to disrupt the game, and that they will likely reduce it to +1 point per level past level 80-90. Whatever build you will go from that point onwards will have all skills enabled guaranteed by the end of the game. Second, as you have pointed out, the +all skill items are going to turn all builds into all-abilities-enabled builds. Well, I don’t: some 30 extra points means getting that second mastery you are struggling so much with finally from 40 to 50 without much planning and maxing 2 additional abilities/passive you would have otherwise left with very few points. I fail to see how 30 extra skill points (given the same progression) is going to affect other builds that much.

Extra respecs in diablo 2