> One kind of bad hire is the technology-lover who values their own preferences over the needs of the business.

OK. This is not a mutually-exclusive relationship. One can prioritize both of these; the best team player will prioritize the needs of the business (and the team) more, however. This to me seems like you're really addressing the problem of "vanity/primadonna devs" who are not team players, and not just devs who really like certain technologies which will possibly blind them.

I also think experience tempers this quite a bit. I've certainly had dev experiences where I became enamored with an idea or trendy tech, felt I absolutely had to implement it, and then ended up regretting it later. I think this happens a lot with younger devs and that's OK because that's how you learn. (Make sure they get assigned the mess cleanup when it doesn't work out though. LOL)