Ah Apples tenet of simplicity...
With their eight models of iPhone and six different iPads ..
Which doesn’t apply to their principle of product design. I don’t get what you are trying to prove by conflating the two.
Their stance is clear - a phone is a phone, and a tablet is a tablet. Merging the two also gives you the worst of both worlds. You have a thicker device (when folded), while losing the ability to take advantage of that thickness to include a better camera. The hinge / crease is also an additional point of failure, and the cost remains prohibitive.
Keeping the two separate allows Apple to make the best smartphone possible, as well as the best tablet possible. I really don’t see the point of the galaxy flip (it’s a normal phone that folds in half?). The fold is great for viewing photos and reading pdf documents, but the moment my friend and I returned from an overseas trip, her galaxy fold’s screen promptly died. And battery life was so-so.

On a side note, what’s up with that green line on Samsung phones? I seem to be seeing more of this occurrence around me, and I am surprised Samsung has been allowed to get away with it for as long as they have. This would have been a massive fiasco for Apple by now. 🫤