This is exactly why I always hold off on updates; my one HomePod is still on 14.5, and it'll stay that way for a while longer now. Let others be the guinea pigs and test it. These events are rare, but I'd rather avoid the headache entirely. It's either things like this, or more frequently, updates that cripple or remove features.
Eventually I'll update when there's sufficient reason to do so - sometimes that for new features I actually want, sometimes for critical security fixes, and sometimes because the old version stops working with whatever service it uses. On the security front, yes, it's best to always stay up to date. But the vast majority of security holes either have no known exploits, or are extremely rare. I take a lot of other measures to protect my security, and I feel the risk of stumbling upon an active exploit (that's already patched in the latest release) is much lower than the risk of a software update screwing up functionality I use. I've had the latter happen dozens of times over the years, and have never had the former happen.