I go back and forth on skills.
On the one hand, as a GM, without PC skills you're looking at the PC's class or background or such to figure out if they would know how to do X. I find myself spending too much time or mental energy making these decisions - I get decision exhaustion pretty easily.
So, I like skills because I don't have to make those decisions. However, finding or coming up with a skill list that's both long enough to cover most things and short enough to be manageable - I find that tricky, too.