Upgrade schedule for Fedora is twice a year, yes. Goes by without any issues, stuff still works.
There is change and then there is change. Yes, I understand that some things don't need to change, and why do they always have to. Do I need my Desktop to still resemble 3.11 because "Why did it ever change"? - No.
Some things in life simply change and they always have. I try to keep up where change is necessary.
And if I would be shipping appliances to customers, why should I have "forced updates" of any kind outside of my control? I would never sell anything without my own repos, quality control, etc.
Do you seriously sell Debian devices to anyone and support them, if anything outside of your control breaks? I seriously don't understand the argument.
And if I ship software of any kind that relies on some libraries, I have to maintain it, of course. This includes going with the major releases.
If this is embedded hardware, where there simply are only two or three updates in its lifetime, everything is different of course, but how on earth would I then have forced updates from RedHat??
This is of course even worse if you are not the end-user but are trying to ship an appliance to your customers. Why would you want to update the entire appliance OS in the field fo all of your customers just to ship a security patch, instead of sticking with the same base OS on already released appliances?