I have wondered why PSA doesn't sell a scanner with a bed made specifically for slabbed cards.
As someone who scans A LOT. I want to chime in here. PSA won't make a scanner for this because most folks don't scan things.
Scanner technology, by and large, stopped innovating about 15 years ago. Generally (but not exclusively) scanner tech is about where it was while all other tech has gotten faster, better, and just overall cooler.
Blame it on digital photography. In the past, scanners primary use were transferring old media into the digital age. But now, it all starts out digitally.
Still, there are the occasional improvement here and there. But I knew when I started seeing more "scanner/printers" than dedicated scanners, I was in trouble. Because I want scanner technology to innovate, not to get bundled with cheap inkjets.
So ends my rant.