I just saw a very old thread about the CVS pharmacy website giving an error message about using a modern browser in response to unexpected user agent strings. The consensus is that’s a bad thing. I would otherwise agree, if not for running Infosec.exchange. I sort through a significant number of issues that turn out to be incompatibilities with older browsers that don’t support certain features. As a bonus, sometimes the person experiencing the issue sees errors in their browser console and accuses me of trying to hack them. I can’t imagine a website with 1000x the visitors, as CVS likely has.