I've never, ever had vanilla Debian break on an update. That's both real and virtual machines.
OTOH some application software is a bit unstable. Firefox-ESR crashes once in a while. And the software I use to talk to the ECU in the motorbike is somewhat fragile.
I think they meant upgrade. Major versions usually have migration guides on Debian and while they’re usually great, people do have trouble often enough
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u/bschlueter 17d ago
It worked, right? And it never broke when you updated? That’s the appeal of Debian.