It's probably not getting OS updates (ie. security patches) after iOS 13, though.
When iPhone dies I was planning on getting another 6s[0], but didn't even really consider LTS. Crap.
[0] Mostly for the headphone jack, but I suppose I also prefer touchid over faceid
t’s not really a huge deal to me that they’re likely purposefully going to try to keep the newest iOS limited to only a few years. Supporting 4 year old devices is still pretty good. And being on an old iOS for a few years isn’t the biggest deal.