I will take a look at the bootstrapping project page, but "bootstrappability" is a philosophical notion whose extent depends on what you are trying to get from it. Certainly someone who pursues it should give that some thought and reach a conclusion, rather than just following a recipe on some web site. So that's the deeper reasoning I felt was missing.

As for C being terrible, well, why would I want to take that up with anyone? It's simply that we know from 50 years of experience with C that writing bug-free C programs, or noticing the existence of bugs in them, is extremely difficult. If someone decides to use it for bootstrapability anyway, xkcd.com/386 would seem to apply.

collapseos.org (which uses Forth) might also be of some interest, though I think that was another questionable decision. Real transparency and boostrapability requires that the reasoning process be written out and matched up with the code. C does a pretty poor job of that compared to some alternatives.