Yeah but that's exactly the same situation we're in right now with distros turning on KillUserProcesses. I can start whatever processes I want to in another scope without having to modify those processes.
... but not with general-purpose tools that use the standard semantics that have been around since 7th Edition. Only with Linux-specific and systemd-specific tools. Which is why it of course is not the same situation at all.
False. People ran such softwares via the nohup command. No program modifications were needed. They still aren't.