> I'm always suprised reading statements like that. No offence, but maybe you're in wrong career if you don't want to learn how most popular and important tools of today work... Not to mention that its so simple you can learn everything required to be efficient during lunch break

This is such a common comment that I am never surprised to see it pop up whenever the "front-end mess" discussion arises.

No, you cannot learn React over a lunch break. You cannot learn Angular and Vue over a lunch break.

I am skeptical that even you, personally, can learn just the footguns alone present in the hundreds of thousands of lines of code in a specific $FRAMEWORK over one lunch break, two lunch breaks or even a dozen lunch breaks.

All those thousands of lines of code implement something, and I will wager a month of my income against a month of your income that you will not learn more than 3 or 4 concepts over a single lunch break, because they all have multiple concepts, multiple use-cases, multiple exceptions-to-the-general-rule and multiple footguns without even including the edge-cases they solve.

You will spend several years of lunch breaks, unless you consider reading the wikipedia overview for each $FRAMEWORK to be "learning the $FRAMEWORK".

Web components, OTOH, have less functionality than full-blow $FRAMEWORKS, but each can be individually learned over a lunch break, reused by non-JS-developers and is a knowledge base that is more or less future-proof.

React is particularly easy to learn tho, much easier then angular.

What you definitely can not learn over lunch breakis whatever local developers created as a local ad-hoc framework. Those area always more time consuming to work with, because you have no internet, stack overflow or documentation to help you.