Remathilis
Legend
I once advocated for a Mordenkainen's Guide to the Multiverse book. A book that did nothing but provides a quick overview of each setting in D&D and then all the relevant mechanical conversions. So an Eberron chapter would just have races and dragonmarks. The Dragonlance chapter would have kender, the knighthoods and draconians. And so on. Just enough to provide a sample of the setting and then guide the interested parties to DMsGuild to buy the older books.
I'm sure that won't happen now, but I'm still up for an MTG version of that book.