I guess that's just personal preference; I prefer to keep my systems up-to-date at least on a monthly basis. Most of the time the updates go without a hitch, and maybe once a year something very minor breaks. If I were to only update once a year (aside from security updates), I would expect many more things to break. And that's what I see from the complaints of my co-workers when they update macOS on their laptops once a year: a lot of pain in the ass issues that take a while to resolve. And this is after our IT dept has taken 3-6 months to test things on the new OS version and allow people to upgrade.

For reference, I run Debian testing until it becomes stable, and then 4 months or so later I switch to the new testing release name. I get an up-to-date system (Debian stable has a reputation for being old and outdated almost at release day), but also skip the part where Debian testing has a lot of churn and possible breakage. The newstable->newtesting upgrade, even though it's a larger one, rarely causes problems, and happens once every two years.