You're welcome to your definition, but if you think developing for desktops, notebooks, smartphones, and tablets, with all the differences they encompass is trivial, you're in for a shock.
Even with other cross-platform offerings like Flutter, React, Electron and so on, getting one codebase to work out of the box on just two platforms can be a challenge. On mobile, there tends to be a need to drop down from the cross-platform stuff to something native for performance reasons — Discord does this for its chat buffer on iOS, Facebook does this for practically everything.
So while people take to their ideological high horses, there'll be people out there who can really benefit from being able to develop for Macs, iPhones, iPads, Apple Watches, and Apple TVs with a single, familiar, and easy yet powerful API to provide a glass of ice water in cross-platform hell.