I actually did that on purpose since all browsers support brotli I risked the possibility someone might have disabled it with an add-on. I wanted to see how many bots that would break. It may not be the most logical process but I just use CanIUse [1] to see what supports Brotli. I ignore the Opera Mini block as they seem to support almost nothing.
Nothing wrong with that. I think people should be able to disable anything they want. I doubt any commercial sites will do what I am doing. I use that little blog to test all manor of unorthodox things. That's why I listed the archive mirror, just in case.
I've seen commercial sites hard-code gzip content in all their responses regardless of the Accept headings. Probably just as fair to use Brotli these days.
Similarly, I've been using zopfli (gzip/unzip compatible) for png compression after quantization for db storage from 2-color (B/W) scans as it's directly compatible to the browser but winds up about 1/6 the original sized tiff. Not the best compression, had a discussion for a better compression, but required a wasm renderer to decompress as it isn't in the browser box.
[1] - https://caniuse.com/brotli