Maybe I'm a fool because I don't feel unhappy when working with that frontend frameworks. :P

Programming language/Framework is just a tool, it's easy to learn and adopt for experienced developers. Obsolete tools are costing companies billions but they already made a business for them that is worth more than the money listed above.

If a tool becomes obsolete, just replace it with a new one and you will learn a new great thing.

The tech industry always rush forward, so I'm happy to rush with them, that's all :D