For professionals and buisnesses, I see where you are coming from (although there is an argument to be made for prioritizing security over uptime whenever acceptable).

But for selfhosting/private users? If I wake up one morning and my stuff is not working anymore, I can just roll back to the last good backup and then apply patches manually to see where it goes wrong. Way better to have some downtime when I don’t notice (i.e. don’t need the service) than having open vulnerabilities when a fix exists.