EE FoT is EE FoT, and is the highest-level raid. (Though no longer the highest-level content.) Melees do fine in EE FoT.
Solo is a player choice, same as perma-death, or naked runs. If you personally are so uber that you want to add artificial restrictions to yourself, that's fine, but irrelevant to the rest of the world. I run top-level content, but I guess I'm not as uber as you, because I don't solo it.
Your claim about casters being vastly OP compared to melee is clearly false for most ways someone might play a caster. It's closer to true if you restrict what a caster is and how it should play to cheesy Shiradi stuff.