Samsung had wanted to eliminate the SD for years, it won't come back. However they did create micro UFS cards years ago that make micro SD cards look like antique garbage but few devices adopted support for them. I'd like to see those in future devices since they are essentially really fast micro SD cards and won't hinder system performance.
That part on the SD was tongue in cheek. In terms of Samsung bringing it back, it seems unlikely, to say the least. I won't QUITE say never, but no, I'm definitely not holding my breath. The tiebreaker is that they have also monetized the decision to drop SD cards by making you buy lots of extra HDD space every time you buy a new phone. (I suspect that's as big or a bigger issue than anything else, propaganda about how losing SD cards is good for me and you aside....) SO, I'm not betting they will ever look back.
I had not even heard of these micro UFS cards. That sounds interesting, but if they haven't adopted them by now, I imagine they are not in line to replace micro sd. Of course, it makes my current not-cheap 1tb micro sd card obsolete.
For the record, I see no problem with system performance with current micro SD cards. Literally, nothing I even
notice on the Note 20 once loaded (and at that point I flip them from phone to phone). Mostly, I use mine for music. It's gonna be awhile before I'm willing to forsake that SD card.