Originally Posted by PairO'Dice Lost
The main problem with requiring skill checks, of course, is that skill checks are so easy to boost in 3e, and a secondary problem is that if you're basing the DC on spell level it goes up by a different rate than Spellcraft ranks based on whether it's using ranks, 2*ranks, or whatever (i.e. the Truenamer problem).
The idea is in 5E skills boosts wouldn't be so common as to not worry about it. Skill Focus feat is fine, and this would encourage taking it. My Pathfinder Sorcerer took Skill Focus Spellcraft because Pathfinder increased its value by using it to identify magic items even with Detect Magic and for crafting items, for which I want to craft metamagic rods.