Ter Stegen with good feet also does those type of clearances- and worse. His shot stopping parallels a young Courtois where he reaches balls few other goalkeepers can thanks to a mixture of length and incredible reflexes.
I don't think we will miss him because of the off field drama that are present with his agent, something that only a club like PSG could manage long term, but a level above what we have. And two levels above Stegen's past season form and injury problems.
Difference is ter Stegen plays with high risk in order to secure that Barcelona can progress the ball safely with control, rendering opponents press useless most of the time. Sometimes there is mistakes, that the team is willing to take in order to have an 11th player to circulate the ball, and start attacks in a great way when the opponents dare to press.
Donnarumma plays without any timing and is just trying to get the ball far away from his goal without any risk - still he got the ball to spanish feet ready to shoot multiple times in one game, I don't think Stegen ever did, playing with 500% higher risk.
He is lengthy and dives, but he made it easy for Morata and he also left a rebound in a bad way and surely made more mistakes that I don't remember now.
If yesterdays game is one where his fans thinks he is worthy of praise it's a good argument against him!