

In 4 years I have never (and will never) used any service from /e/. There is no vendor lock whatsoever. That’s fully optional.
Points 3, 4 and 5 in your list are moot IMHO.
Also
It takes a base level of understanding why you would buy a Fairphone
It doesn’t really. “Phone is repairable and X can help me”, “they pay the makers fair wages” are not really complex value propositions that require some (technical) understanding.
The point of /e/ and similar distributions is that you can buy a phone with it (average user will never reflash) and just have a phone that doesn’t use Google (it does, for the amount that doesn’t require you to do extra technical stuff and have a sane user experience at the same time).
That said, calyx seems a great alternative and so are iode. I think the advantages of one over the other (for my brief search) are quite small.
Why would anybody care? The only thing that matters is who uses them to make good stuff.