Cognitive walkthrough of automatic and manual upgrades
I never use Tails Upgrader myself and we don't have RMs resources to do a usability testing of the whole process, so I'll do a cognitive walkthrough of the entire processes.
Upgrades are still the most frequent complain when interviewing users, I'm afraid that #15281 will actually make things a bit more painful for people with poor Internet connection (eg. most of the Global South), and there might be other low-hanging fruits elsewhere (doc, phrasing, feedback, etc.).