2 points
Before my switch, i used Ubuntu exclusively for 13 years in row. I always heard of problems (and not at least because of the PPA repositories) when upgrading from one major version to the next, be it a LTS or not. I never did that and always installed fresh because of these stories. Mostly 4 years in between, or sometimes 2.
Its entirely possible that most problems happened because of packages from PPA that the user did not change for the new upgrade. Because PPA repositories were often designed for a specific version of Ubuntu. So its not entirely the fault of the apt package manager in that case.
2 points
