> Just like every sane regular programming language has concepts of classes or modules or some kind of system for divide-and-conquering problems into pieces, your front end needs that too once it gets complex. And that's what these React/VueJS frameworks are doing for me.

One question which should be included in that is whether you need a huge framework and supporting toolchain or just ES6 classes. There’s a good argument that using standard features will last you longer than frameworks which rapidly go in and out of vogue, and it avoids the constant frictional support costs of regular forced upgrades and debugging complications.