A new framework every 18 months or so is fine until you get too old to learn the new tricks. In my case that happened with React at age 60 when having used callbacks for a decade or more this new f%$^&led thing called a promise came about that just threw me for a loop. AI would have been useful to write that code for me but it was still 5 years away. There used to be legacy codebases still running like business applications written in Cobol that ensured employability for old dogs but not the case for javascript.