If everything "just works" for you, then you must not do anything experimental in the slightest. Even people I know with decades of Linux experience make stupid mistakes occasionally.
What good is a snapshot after an update? Well, I can roll back stupid user-related mistakes that I might make, or recover previous versions of files that I overwrote by mistake. Scheduled backups cannot provide the same level of protection as a snapshot after every reboot. If you still doubt the benefit of this, stop to consider that all other rolling-release OSes (including Windows and MacOS) support filesystem snapshots by default. I suspect the real reason why Solus doesn't support snapshots in 2021 is because they opted to use a boot manager that never got developed far enough to support more advanced filesystems before it was effectively abandoned by its original creator.
Anyway, there's still the issue of deduplication and transparent compression, which are beneficial even if you never snapshot anything.
So...thanks for not answering my question, I guess.