Sorry for waking up the old thread again, but I was somehow directed here with newer Barzahlen threads.
Bunq already supports things like iDeal (Netherlands only), Dutch Switch Service (Netherlands only), Apple/Google Pay (selected Countries), so why not Barzahlen?
Especially if bunq wants to become a bank for all everyday banking, cash deposits are a must for me. It's not about huge sums, but for me, mostly about small coins.
Although I still have a German bank account, just for SCHUFA's sake, girocard only stores and extreme cases of SEPA discrimination, I don't really like to use it because of their customer service and the app. There, I could do cash deposits via Barzahlen. Apparently, it's not that complicated to implement that, so why not?