My 2019 is going in next month for three recall related items. Two of them are software related and one is for the brake light.
None are safety concerns and to be honest, I like the fact the Mercedes cares enough to fix the smallest items that they find are not normal behavior in their line of vehicles.
Both of my Fords and a Honda fell into the airbag recall debacle. We had to drive those for many months before the parts became available. Talk about a safety concern!
Yeah, it's a pain and I'm certainly with you as far as the shear number of recalls these vans have had. Overall though, I wouldn't trade mine in for any other as the overall fit, finish, and ride quality won't be found anywhere else at this price point.
Good luck with your recalls!