Oh yeah, I agree with that - but that's not job being "interesting", that's just job security.

I wrote my comment because I felt some disingenuity in the OP saying that jobs with modern tech stacks are interesting for him. It means that he's either genuinely intersted in following the tech frameworks threadmill, and jobs with modern tech stack allow him to do that - or, he's lying to himself that he's intersting in it, to make getting up for work every day a little bit easier.