PHP I worked on from v4 for couple of years. My main gripe was that it was full of idiosyncrasies, implicit knowledge, heavily inconsistent and heavy on the boilerplate. After moving to Django I felt I could finally think about logic, and not checking if this one dude didn't use non MB prefixed function on string (which - for unaware - could end up splitting utf8 char into two).

As for Python3 there was this thing that at some point Python was supposed to move from 2 to 3. This change was to bring plenty of incompatible changes, and in a way that migration was outright impossible in normal sized projects. Then community split into two parts, some said "F-- it" and held on to Python2 and some said "F-- it" and moved to other technologies. In the end Python2 was sustained for many years (originally sunset period was short) but those who moved out didn't consider it "stable tech" anymore.