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What are you even talking about?! If we're talking about USEFULNESS, not just the power of ranged units at high levels, then the situation is as follows: I see 3 Castles that heavily rely on ranged units: Castle, Rampart, and Tower.
For the Castle, it's undoubtedly the Crossbowmen.
For the Rampart, it's obviously the Elves.
For the Tower, it's primarily the GREMLINS! not the Titans!
The other Castles don't heavily rely on ranged units, but ranged units are always a plus.
For the Necropolis, any ranged unit is good because it makes it easier to mow down skeletons. And that's the most important thing for the Necropolis. (As long as the ranged unit doesn't get demoralized).
For the Dungeon, the Trolls are the most important, not the Lukari. Even though there are 2 ranged units (as proven by Lebron :D).
For the Conflux, even in the un-upgraded version, the Air Elemental stack is good, and you can upgrade it in the second week (along with the Water Elementals). And if you combine it with the Water Blessing, it's amazing.
For the Stronghold, I don't know who was betting on Cyclops here. Orcs are more likely to be used. But the Griffins with the Roc and the Cannon are more effective than the ranged units themselves.
Well, for the Swamp and Inferno, it's clear that only the Lizards and the Gogs are used.
That's the gist of it.