Oh I already have the ADIT stamp (but not in my passport) and just came back from Europe some weeks ago with no issues. It expires march 2025 so I'll definitely just contact USCIS for a new one then. Thank you so much for your reply, it is very reassuring, these fees are so high already and I'm not keen on filing the I-90, I mean I'll do it if I HAVE to.
I'll keep your answer in mind but will send a message and/or call USCIS as well. Our case has been pretty straightforward and I'm not looking to get an RFE for the N400.