This deals with the biggest problem I have always had with systems like Diablo 2, where you can either diversify your skills, and have a lot of weaker skills, or just pump all of your points into a single one to become 'all-powerful'.
Except that's wrong, because you could never put all your points into a single skill - it was capped at 20, which generally gave you 4-5 maxed out skills (an arbitrary number, as well) that defined the focus of your character and created the potential for diversity.
The problems were:
A) The introduction of synergies in 1.10 alongside major stat rebalances meant that to be effective at all, suddenly you had to focus on 1-2 skills and use every other point to boost them (this sort of creates the situation you mention, but it has an entirely different cause). There is a similar situation with the Mastery skills, that effectively created a 20-point sink for some classes.
B) Some skills were so ridiculously well-rounded and powerful that there was no need to diversify beyond honing a single skill to maximum power + a few support skills (Hammerdin, etc). This is a balance issue.
All I see is that rather than polish the system or fix the most glaring issues, it was scrapped altogether. Again, that's not a good or bad thing (it'll depend on how well it gets executed), but implying the skill point system was the root of all lack of diversity is short-sighted.
Even the smallest donations help keep sc2sea running! All donations go towards helping our site run including our monthly server hosting fees and sc2sea sponsored community tournaments we host. Find out more here.