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That's ridiculously naïve. You can't just decide to let your product be broken for 80% of your users because it's technically their browser that's wrong.

I see these kinds of suggestions from technologists surprisingly frequently, and I always wonder if it's a serious suggestion and if the person has ever worked on anything with non-programmers as users.

Potentially can’t notify either if you don’t have a UA string

You can notify all users until a major browser vendor fixes a known bug without a user agent.

At that time, about every audio library was broken for 80+% of the users. If you happened to maintain such a library, you received bug reports for sure (on your library). Chrome claimed their new implementation was inside specs, so it was unclear, if there would be a fix. As it happened, the specs were amended/clarified and Chrome returned to the previous behavior a few versions later.