Andrew is usually spot on regarding most things, however... My CS6 stand alone Adobe Photoshop that I bought legally and had used for years suddenly wouldn't work. I was told by Adobe that I was not allowed to use it any more, then they said it was fake, even when I produced the original bill of sale. And pointed out that is was listed with all my adobe bought products (LR from ver. 1.0, Premier Elements) in my profile for years. They still didn't back down. I suspect it was because I never took out a subscription, I was still using LR 6.13 stand alone at the time.
Roll forward 18 months and I solely use C1, Affinity, Capcut and Resolve. LR is on one machine and I use it for older stuff that I stupidly converted to .DNG and C1 won't open. Needless to say when they pull the plug on my standalone LR6 I'll be screwed... Thx Adobe..!
Going back to the OP's point, I currently 'buy' C1 every couple of years, here's the main reason:
Lets say you are on a big shoot for client with deep pockets, its a 2 day gig in a studio, day one, your digi-tech tells you 'hey last night C1 brought out an update, give me your camera because tethering via Thunderbolt isn't working properly..!'
This type of sh!t happens, so staying a few versions behind helps with stability, same with computer software, camera firmware, cameras in general actually, cars, phones the lot, let others be the crash test dummies.
I currently run C1 ver. 22 and will 'buy into' the latest version because I think I can now tether and write to card using a Nikon, which is a feature I like, most of the new features from speed edit to speed adjust are aimed at people who shoot with a lot of things on auto (TTL, white balance, face auto AF etc) these things I don't use.
There is something to be said for embracing the advancements in tech and I'm all for it.... when it works and is reliable.
I wonder if Adobe will let me buy/rent CS6 stand alone again for a fee... they need the money..!