"one recruiter I recently spoke to React only accounts for 7% of job requests flowing through their agency."
Tech stacks can cluster around particular hubs in different cities and countries. I'm in a MERN stack hub here, but in other places you might look at the local market and realise it's all LAMP or the front-end is vanilla JS and jQuery. Had a company present at my bootcamp who used Backbone with no plans to migrate away.
Trends change from place to place.
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