Yes, it's a good point, but I'm afraid it's like devs dream. Still, I see old, happy AngularJS or even jQuery in big enterprise projects and companies look for people with that skill. What is funnier, most of these projects are the best paid.
Oh yeah, once you know a skill that most people don't learn anymore you are a rare beast and there are plenty of large Enterprise software that it's too painful and expensive to migrate. I also work on an Enterprise SaaS, it's a large codebase but not huge and it still took us 3/4 months to migrate to Angular 7
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