[MENTION=22060]fergus90[/MENTION] is spot on about the footwork of keepers these days being, not a standout feat to brag with, but a given.
Apart from Donnarumma maybe.
There are four rough levels of keepers feet
1. Bad and insecure
2. Bad and secure
3. Good and insecure
4. Good and secure
Most modern keepers are in #2, which mean they can pass to a completely free CB, or roughly find a wing back with a lofted pass when not pressed, otherwise he bangs it as far as possible, or towards a space.
Quite a few are #3, then some teams think it's a risk worth to pay in order to be able to use him actively in build-up. Barcelona was like this with Valdes.
ter Stegen is as close as a 4 I've seen, sure he has made some errors but they are very few. He plays very elegantly and almost like a midfielder in his timing and vision.
What is REALLY striking is a keeper like Donnarumma, who is bad with the feet, still gifting the ball in that very insecure way in a game like vs Spain. He looked like a #1 there, and that's not so common.
I think Barcelona should build around controlling the ball, so I think they should always look for a 3/4. Of course, under Valverde, or with no manager, or with players like Depay, Wijnaldum, Kessie, Araujo etc, then you can't reliably build from the back or control the ball, then you may as well play with someone who hoofs it. But then there are so many players that needs being switched, like Alba, Busquets or even Messi - and I know there are posters here who can't wait for it.