I was going to suggest the ability to stack multiple LPs on top of each other and have them drop when the prior one has finished.
But I won't, because then it would have to adjust the VTA. I am, of course, joking, because the record clamp issues would be tough to solve. No I am not serious.
It pisses me off that pressings from the 60's and 70's often have sides 1&4 on one disk and 2&3 on the other - or even worse 1&3 and 2&4. And it gets really crazy with multi disk opera LP sets.