:)
This has been my point for this entire discussion: they do. The audio industry (particularly hardware manufacturers) are notorious for not being ready for the release of a new OS version. It takes many of them (e.g. FocusRite) months to provide compatibility. This a problem that is typical to this industry (though they are far from alone), and while “mass incompetence” is one way to look at it the reality is that customers do not demand it, it’s harder than just waiting until release (since you have to deal with bugs and the frequent beta update cycle), and it’s potentially disruptive to a software roadmap so these manufacturers and publishers don’t prioritize ensuring updates are ready for go-live.
The link you reference does not seem atypical for an OS release that is less than two weeks old. The holidays will push that out, but expect to see items falling off of that list by mid-December or EOY, since they do have to consider compatibility with brand new hardware purchased as gifts (or with bonus money, etc.) that come with the new OS preinstalled.
Also, keep in mind that the list is not a list of items that are actually broken. It’s a list of either known incompatibilities or simply that a particular product has not been tested against Big Sur. Many of the items on that list likely actually work fine, but the manufacturer has not yet completed testing.