Apple apparently sold a couple million iPhone 13 minis. Ford reliably sold more than 100,000 Focus cars in the US annually before deciding to discontinue it. But Apple and Ford decided they were better served redirecting that engineering effort towards more profitable projects.
It just frustrating when these gaps occur and there's no smaller player to fill them. A couple million small smartphones or a couple hundred thousand compact cars sounds like enough to sustain a business, but it isn't enough for the big players to care, and small players can't affordably create a competitive offering.