It's not shocking to me at all that there are people who aren't exactly ecstatic to have their experience complicated, however slight it might appear to be to many of us.
Something that's come up time and time again with change related frustration in this place is that many of the members here consider this to be their Internet home, something I put down at least to it being one of the last bastions of the internet's community feel before the social media era and the complications that had brought. With that in mind, I think it's easy to see why people might feel less than happy with changes like this, especially when they seem to come out of nowhere and it completely blocks their access. Most of the time this sort of frustration can be avoided - or at least limited - by displays of empathy from the mod team and proper communication of the intended action ahead of time.