Web frontends are replaced every couple of years, often triggered by new feature development using the shiny new framework, and the cost of supporting the old, now unpopular framework.
Focusing on the actual web standards instead of another framework abstraction has long term value. For example, being able to query a DB using SQL is as relevant as it was 30 years ago, despite the numerous ORM/QueryGenerators on top of it.
That's often true, but the situation is not much different to framework stagnation.
"Popular" frontend frameworks I have worked with throughout the years, which are all more or less obsolete now:
Dojo, KnockoutJS, ExtJS, Backbone.JS, AngularJS, Angular 2+, Ionic
Web frontends are replaced every couple of years, often triggered by new feature development using the shiny new framework, and the cost of supporting the old, now unpopular framework.
Focusing on the actual web standards instead of another framework abstraction has long term value. For example, being able to query a DB using SQL is as relevant as it was 30 years ago, despite the numerous ORM/QueryGenerators on top of it.