No one is forcing you to use the latest bundler / tool / programming language. Let others experiment. You’ll be happy to reap the benefits of their work when something mature comes out of it.
Tell me that when you get turned down in a job interview because you don't know <JS framework of the year>.
This stuff comes up in interviews. Trying to avoid answering direct questions about a framework and answering with "Well I can learn it really quickly because I'm a good vanilla JS Dev" doesn't fly all the time. If you can't answer direct questions about a framework, they will pass on you if they get someone who can answer those questions.
It has nothing to do with marketing yourself.
There are tons of companies that are going to do certain things you aren't going to be a fan of. Isn't it better to find out they're not that into mature platforms and prefer the latest trend during the interview and not on the job?
(in JS ecosystem)
1. It's really hard to find something that works
2. It's really hard to figure out all the dependencies, and configs, and plugins, and conventions, and ..., and ... for something that works
3. Once you have it figured out, each and every moving part, including the tool itself, will get updated with deprecations and breaking changes.
Except everyone is using them and you get quickly outdated, specially if you are looking for a job with heavy experience on python, php and asp.net web development. The market already shifted to "3 Years worth of experience on Parcel".