You only hurt yourself down the line. My last job had not improved their own product, processes, tools or frameworks, so everything was still stuck in the 90s. Their product was build on an discontinued an proprietary database and server system you never heard about, jQuery UI from 10 years ago and other BS.
However if you don’t upskill yourself in this situation you will be unemployable in the future, because all other employers demand modern technologies, git, docker, unit testing etc., which I was yelled at in meetings for suggesting it.