Looks like most of the apps you are using in Setapp are utility apps. Most of these has major update for at least 2-3 years so you are good to go.
I sign up to Setapp monthly when I need it. There are a couple of apps there that is much cheaper for me to rent from time to time when I have a paying gig that needed it.
Plus, Setapp’s intention is to actually showcase you the apps and they are actually encouraging people from buying directly. There’s also some benefit to some developers, like Yoink which hasn’t had any paid upgrade in the past since it was released. They earn a bit from people who have their app installed on Setapp. I own it through MAS too, but prefer to install the Setapp version just to give more to the developers.
I suggest, buy the apps you used daily. Sign up to Setapp when there is an app you wanted to try or use for short amount of time. Then evaluate again if you need those apps for your daily use.