Google can turn around tomorrow and say that no browser without WEI can access GMail, GMaps, GSheets, Photos etc; people will have to comply, effectively killing any browser that does not support the feature.
This is the problem with the Chromium monoculture. "We", as generic IT people and developers on HN, definitely have a responsibility for not deprecating this monoculture earlier. If you use Brave, you're guilty; if you use Ungoogled Chromium, you're guilty; if you use Safari, you're guilty. It's high time people start taking responsibility.