You could write a website that doesn’t use JavaScript, is meant to be accessed primarily through curl, etc but if it’s a business project then you’re going to end up with a product that your users (average people) will view as more janky than otherwise, and you’ll spend more time and money on it too, for the benefit of 0.01% of the population who would be slightly inconvenienced if you didn’t.
The Unreasonable Effectiveness of Simple HTML:
https://shkspr.mobi/blog/2021/01/the-unreasonable-effectiven...
Are any companies foolish enough to assume otherwise? I understand there is a minuscule number of users who don't want to run JS in their browsers, but aside form Amazon and their near-unlimited resources, who is catering to that small number of users?
For features that have been very widespread for enough time, it's okay to have a javascript polyfill as the only fallback, in general.