My understanding is that smaller phones get less screen time. Thus if you have some interest in increasing it, better to push bigger ones. But I don’t know if those perverted incentives make it back to the manufacturers. Do they make the most money from sale itself or after from the various ad-/data brokers?
Z Fold 6 and earlier were slim, one handed use phones when folded, small tablet when opened.
Now it's just a regular phone, and a medium tablet when I open it.
First phone I've ever regretted upgrading to.