I kept an iPhone Mini until an App I need for work started consuming so much memory it became unusable on it (iOS would kill it after 15s). Even then, I raised ticket after ticket with support to get them to fix their app – which they did, then slipped again, for months.
Now I own a 17 pro, which feels like a brick in comparison but has 12 GB of RAM instead of 4.
I really miss my mini.