When evolving for wishforge, almost everyone uses the farm page where it shows all RTE Pokemon.
Align to grid already makes it a lot easier to see specific Pokemon, if you don't have typings memorized just hover over them.
I would never use this. The only fields that have mixed typings are my favorites and legendaries, and I know what's in there already.
This isn't to show pokemon that are already RTE, its so you could see specific types of pokemon and put them into different fields or something. Without this option I'd have to go through all of my fields and sort through them to find the types of pokemon I want to evolve for my next badge. And not everyone has their fields sorted by type; in fact, most people just sort by berry, or put different types in fields that are compatible with them. It would be useful for many people that don't have sorted fields and want to put a certain type of pokemon in a field or in their party to make it easier to evolve them, since sometimes people only click your party and the first few fields.