Any complex system - and these cloud systems must be immensely complex - accumulate cruft and bloat and bugs until the entire thing starts to look like an old hotel that hasn’t been renovated in 30 years.
This story is more interesting, in my opinion, in how quickly things devolved and also how unwilling the more senior layers of the org were to address it. At a whole company level, the rot really sets in when you start to lose the key people that built and know the system. That seems to be what’s happening here, and it does not bode well for MS in the medium term.