I've tried tablets over and over again over the years, there's tablets in storage all over my house. The phone/tablet combo to me suffers from 1 major fatal flaw, the tablet is never around when you need it the most.
You can't carry tablets in normal pockets, sure you probably have some jeans with bigger-than-normal pockets, but now that's the first friction point: needing to ensure you wear your special jeans.
Now you need to carry it separately, not just slapping it in your pocket and going out the door. The second friction point: Always needing to carry some sort of small backpack/fanny pack/something to carry the tablet or resign yourself to letting it be loose in your car (Assuming you even have a car) or carrying it in your hands everywhere.
To me the foldable solves all of that, it's a phone when you need a phone, but got caught up in an unexpected long wait somewhere? Boom, tablet, ready to go when you are when you need it the most. And that's not even getting into things that tablets can't do, I for one have fallen in love with the ability to partially fold it like a book when reading.
I use it for dnd sessions, brainstorming, sketching, anything I would use a regular sized for.
I also use it as an extra screen to watch YouTube or something on while I'm gaming at my desktop.
I would love a foldable to have if I started having to go back into the office, it would be nice to take notes on in meetings. But they are just too big for me at the moment.
I mean the whole point of a foldable is to be a normal phone, until you need the bigger screen the most. Excluding the Galaxy Folds, dunno what Samsung was thinking with that, it's way too narrow to satisfy the normal phone part.