lifetime plans never work out at the end.

Support plans wouldn’t really work for me. As the expression goes “I know my stuff”.

For the most part, Installation/integration, at the beginning. Reading the documentation helps me out. I rarely ever use the support of a plugin/theme.

I do not think annual licensing would work for me. There has to be something better for me.
I have a theme from themeforest. I haven’t used it in 2-3 years. I have not renewed it. I still get updates for it.

Think of it as your local public transit. I would get a monthly pass for unlimited usage. July and August would be questionable as I would tend to go on summer vacation. So the July and/or August monthly passes would not be worth it for me. I wouldn’t get a July and August monthly passes and just pay the $3 something to ride the few rides each of those months, if any.