They are, but mostly in budget phones. If you want a flagship camera or processor as well, you're sadly out of luck. And god forbid you want a folding phone.
Which is pretty stupid because you'd think that it would be really logical to have a way to have plenty of storage for those flagship cameras which would fill that lame ass basic storage... I mean do those flagships have more than a TB of storage? I'd think not most models.
Oh I know, I'm still on Motorola because they have unlockable bootloaders and SD card slots. But in recent years they've started taking them out of some of their mid-range models.
Point is there should be more options. Removing the SD card slot is just a bullshit way to push cloud storage.