I dont think there has been much change in the javascript world in the last few years that hasnt been strictly beneficial. The biggest paradigm shift is probably the widespread use of typing on the frontend with typescript and flow.
Take a look at Svelte 3.
1. "Svelte is a component framework — like React or Vue — but with an important difference. Traditional frameworks allow you to write declarative state-driven code, but there's a penalty: the browser must do extra work to convert those declarative structures into DOM operations, using techniques like virtual DOM diffing that eat into your frame budget and tax the garbage collector."
Is this a practical concern for folks writing CRUD SPAs? I've never experienced degradation in performance due to virtual dom diffing.
2. "Svelte runs at build time, converting your components into highly efficient imperative code that surgically updates the DOM."
Angular has its ahead-of-time (AOT) compiler for applications built in production mode. Is this any different from Svelte? It sounds like Svelte claims to be novel, but Angular too does build-time template optimization.
Just in case, I'm being serious. I'm a mostly backend dev, and haven't spent significant time working on frontend code in several years.