That most startups are Underpants Gnomes, the company probably won't succeed even if they ship.
Even if the company is not Underpants Gnomes and their fundamentals are sound, succeeding or not is still largely luck based.
Maybe the reference to Underpants Gnomes is too dated now? - https://youtu.be/a5ih_TQWqCA
Not that every company I've worked at succeeded, but I hoped that every startup I joined as an employee would.
Now, as a contractor or consulting company, you still want the client to succeed, but it's much easier to be arms-length, take orders, and collect your check.
* they don't think the solution is overcomplicated
* they don't really care about the startup succeeding
* they don't know what the ramifications of picking the wrong technology will have
* they think the risk of learning something new is outweighed by the value to the company (or themselves)
I don't think startup employees are altruistic, but picking a tech you know will have a detrimental effect on your employer strikes me as shortsighted.
If given a choice between Vue and React, I might prefer Vue. But I would still choose React as a tech lead because I know it is more marketable and you would get more self interested developers and it would be easier to recruit for.
Technical correctness is not the only factor, there are other kinds of correctness, as you point out with React: "you would get more self interested developers and it would be easier to recruit for".
I was building a SaaS application (as a tech co-founder) and chose rails. It was newish to me (I'd done 1-2 projects) and I admit, I wanted to get better at rails. But it was also, after assessing the options and my (limited) knowledge of the future, the tech with the best chance of helping the company succeed.
I have definitely run into startups where there was overly complicated technology, but tended to be later stage and have raised some money. As a founder/employee #1, I have a hard time believing anyone would pick tech just to burnish their resume; they should be trying to ship so the company succeeds.
What am I missing?