Yoshi’s Woolly World probably still counts. It got a 3DS port, but it’s a game whose visual identity is a huge part of the appeal, most of which is lost when running at 240p. In terms of games that probably should be on Switch, I think the Zelda remakes and Yoshi are the last ones. Kirby and the Rainbow Curse and Nintendo Land would both be hurt by porting to a system with “normal” controls, to the extent that they probably won’t bother.
The implication I got was that Agatha was giving Rio bodies in a sort of unspoken deal to keep Nicky alive–hence her coming and taking him when Nicky backed out. Going a step further, maybe Rio knew that Nicky was no longer going to go along with the plan after this one time that he refused, so he no longer served her needs.
The idea there would be that Agatha can’t face him because of the deal she made him an unwitting party to. Based on his nature and how Agatha described him, it seems like if he had known why they were out killing witches constantly (trading their entire lives for an extension of his own), he would not approve.