They can want what they like, but most customers for coins will probably always want a large screen with which to examine such small merchandise in such minute detail. If they fail to address that need with convenient features, they likely will lose that market.
I haven't really experimented with it other than I have noticed mine don't always appear in a search. I would assume the behemoths like you mentioned do get their listings always shown, but only they could really answer that. Either way I don't understand why they would want to limit potential sales like that. I guess it is possible like some people think that they just decided to change the terms instead of addressing a problem with the coding if that's why it happened.