It's not that tough to keep up with FE. React has been dominant for closing in on 10 years now. ~2015 was probably peak framework fatigue. If you left the industry in 2016 and came back now, you could probably get productive and you would even recognize a lot of the tools.
The HN meme is that "Well ackshually you could build Figma with ASP.NET Forms, just like we used to do back in my day." That just doesn't resonate with anyone doing the work day to day because applications themselves (not necessarily the front-end tech) have a much higher bar today.
The idea that React 10 years ago is the same as React today seems to be highly oversimplified. React was simple, then hooks were added, and state management fads that turned something simple and intuitive into an IQ signalling exercise. At least that was the case when I switched to back-end only dev a couple of years ago. And of course other parts of the stack also keep evolving: TypeScript (which is probably a positive, but again, I know people who do bizarre things with the language to build their "nerd cred").
Off the top of my head there was also Grunt/Gulp/Webpack/whatever is around now. NPM-Yarn->NPM. Angularjs->Angular 2.0+.
How many different CSS positioning methods are there? (that's what led me to leaving front-end, I was expected to do a pixel-perfect rendering of a design for a time-critical back-office app for some reason).