Read moreI 100% agree.
OP mentioned Varus, whom I OTP since the second half of season two, and he is the perfect example of a dual scaling champion, so I'll leave my input here, especially about him.
A champion that can be built either AP or AD is very healthy because right now, most if not all champions that can be built so feel very different from one build to the other. This practically makes it like it's two different champions. For instance, Varus has 3 viable builds: crit, lethality, and AP. I will straight up ignore crit varus though because he is way below the other two in my opinion.
Lethality varus is a poke champion that can turn around teamfights with his super low CD ultimate (with the regular lethality build it is about 27s). The build revolves around sniping and making sure he is impossible to catch.
AP on the other hand is an all-in build that revolves around oneshotting anyone with a delayed burst, taking more risks because he needs ...
Ya I think Varus is one of the champions who does alt builds very well.