None of which have any relevans here as they are not included in the feats.
Caster feats: One has +4 dc to evoc, another +4 dc to necro etc. One has +cold, another +repair etc. This results in many, weaker feats than simply having 1 feat that adds +4 DC to all schools and +universal.
Melee feat: + doublestrike adds to add types of weapons. + melee power similarly. Thus fewer feats. One could make multiple weaker feats by splitting these effects up based on weapon or damage type to achieve what you are seeing for casters.
So, your complaint is flat out misguided as far as I am concerned. Fewer, but stronger feats that consolidate rather than split up power is more desireable not less.