Second function I think is also pretty bad is as a sort of neurotic attempt to impose order or self-optimize, Marie Kondo tells you where every towel goes and then all your stress goes away. In some cultures you'd have a feng shui consultant come and rearrange your furniture and the western secular version is hiring the minimalism assistant.
In that sense I think people are mostly consumers of minimalism as a replacement for whatever else they were consuming, it's not actually about cutting useless stuff out which doesn't need an *-ism because it's a banal wisdom you find in every religious book on page 2.
Other example of this phenomenon btw is note-taking apps. There appears to be a non-trivial amount of people who are so obsessed with the process of note-taking they spend more time optimizing note-taking than they take actual notes, or do something to write about.