The business customer who actually pays for the development.

Then it’s my duty as a responsible customer to not make it profitable for them, as much as I can.

Maybe if you can’t use the web without disabling JS, you shouldn’t?

Suppose I can use the Web with JS disabled. Just that page won’t be part of my Web.

Yes, of course when the optimization work has been done for you, it’s the easiest.

It’s an old discussion about monopolies, monocultures, standards, anti-monopoly regulations, where implicit consent is a thing and where it isn’t, and how to make free market stable.