I finally researched this S21U more. It supports the Spen, but not included, you can buy that for $40 and probably have to wait month or more for it as it will probably be on backorder. Then you need to buy a case if you want to carry it on the phone with you, $70 for both case and SPen.
I see all the reviews thanking samsung for lowering the price, the price should be lower. No SD card slot and you have to buy the Spen separate.
This is the first samsung flagship phone that I have zero interest in. There is no way I would leave a note 20 ultra or even a note 10+ for this S21U. I'm looking forward to the fold 3 havimg SPen support, but if it's set up like the S21U, I have no interest. Far as I'm concerned, samsung is opening the door to explore elsewhere for phones. I manage 10 lines and all are samsung phones because that's where we pay attention to, but samsung is focused on following apple now days, so might as well look at all phones.