I considered doing this, but ultimately decided against it. First, it will require you to "break apart" the feats which don't have ability score increases attached with them. Luckily, those feats give a lot of stuff, so those can be broken up. Giving a feat (half a feat) every 4 levels and a single +1 ability score every 4 levels means there will be times when those ability score increases do nothing. This is the primary reason I abandoned the idea. The "math" of 5E, looking at the Monster Baselines in the DMG, "assumes" that you're increasing your attack stat at 4 and 8 based on player Attack vs. AC. The offensive weapon-user feats are balanced against this "loss". Now, this is only when fighting opponents whose CR is equal to your level, but that's a fair ceiling to be thinking of. I'd be more tempted to split the feats and still give a +2 or +1/+1 every 4 levels. But I like super hero PCs, and am more than willing to throw harder challenges at them to compensate.