Try searching Google for “iPhone won’t charge past %” or “iPhone battery declines whilst charging”. You’ll see the ‘issue’ isn’t limited.
I use my phone a lot for streaming music though, so users who don’t use the phone much may never encounter the charge cycle limit.
There’s so many other techniques too - battery health declines rapidly on newer phones now to prompt users to upgrade. Other things like the software introduced screen flicker as the phone comes on, etc etc. it’s disappointing from a brand that charges a premium price.
I’m a huge Apple fan, and have items from almost all their product lines, but I’m done with the brand now sadly.
Apple are pushing hard with these tricks to make up for the sales decline in China basically.