At this point, there is no reason to support <IE11 style JS, but JavaScript-less browsers are still A Thing and always will be. Search engines, Opera Mini, various accessibility thing, people with extremely low bandwidth, and weirdos who choose to disable JS are all factors.
Yes, if you're making a webapp, there's no good way to do it without JS and you can just be upfront about that. Also, people who can't use ES6+ are going to zero over time, so it's fine to just write ES6. But you should also have a no-JS fallback version of an information page (anything that's not a webapp) because that's an important usecase that won't drop to zero over time.
At this point, there is no reason to support <IE11 style JS, but JavaScript-less browsers are still A Thing and always will be. Search engines, Opera Mini, various accessibility thing, people with extremely low bandwidth, and weirdos who choose to disable JS are all factors.
Yes, if you're making a webapp, there's no good way to do it without JS and you can just be upfront about that. Also, people who can't use ES6+ are going to zero over time, so it's fine to just write ES6. But you should also have a no-JS fallback version of an information page (anything that's not a webapp) because that's an important usecase that won't drop to zero over time.