You could say the same thing about software engineers. But someone spending their days just creating JS frameworks is oh-so-productive and paid enough money every month to buy several years’ worth of food and shelter.
Now you can go to Mercado Libre (the local version of Amazon) compare prices and see the reviews and buy them in 15 minutes. There are a lot of more choices and the prices are lower (or higher if you like fancy stuff). It arrives home at the afternoon.
Some software engineer has to program it. Does s/he deserve a few bucks for the time s/he saved all of us?
If someone is willingly paying money for their labor then I see little point in questioning the worth of that exchange.
When JS engineers start asking for public money to support them writing JS frameworks that no one wants to pay for, we can revisit this topic.
I think it is sad that many of the people that have the largest positive impact on society — teachers, care assistants and the like — are also some of worst paid.
While a "Javascript Framework engineer" is a very neutral example how do you feel about the engineers working on ads, making exploitive predatory video games, gambling apps etc. etc. they can get paid even more yet the net value they create for the society is negative.
Even hundreds and thousands of years ago, people would put semi transparent rocks onto shiny metal shapes and sell those useless gadgets for a lot of money.
If customers are willing to pay for that, it means that those people made something worth that money.