This might be the most INFURIATING thing I've ever seen, but only because I'm heavily invested in them. The shit that they do is far beyond the realm of being just normal friends so seeing them just doubting themselves is actually making me want to kms.
I really enjoy it though, it's so normal to the point that it's actually kinda interesting? I don't really know how to describe it. I would say that the best thing this manga has is the dynamic of the two characters just talking and stuff.
I would complain that there's really only 2 actual characters and everyone else that appears is just an extra, but that's not exactly a bad thing. This would just have to compensate by making the main characters more interesting and honestly I think it does that well.
I would recommend it. I don't think that it deserves the 9.5 rating that it has but it's definitely good nonetheless. Just read it.