The very term "HA" still gives me nightmares. It can be very hard to get HA to work correctly. Many years ago, I worked in a startup and one of our main offerings was an HA network device. It was unbelievably finicky to get it to work in the first place and even harder to update the software on an HA cluster.
It's HA by intimidation. The cluster is complex enough that nobody even wants to touch it, and since human errors are the most common type of error out there, it breaks much less often.
Yes I believe this is why you see things like k3s in some iot/edge deployment scenarios. Because other alternatives for HA like OpenSAF have been severely lacking for years
