no, that's silly. rook's ability not only heals him but it stops towers from attacking and rook's is just a utiloity he can use with is own towers too, and QoT just rocks them
so the specific attacks are much better, it works well, and doesn't limit the other demigods to only autoattacks
and the true role of those characters isn't to simply kill towers. rook can hold lanes, he can push slowly up, he can take down towers(but so can regulus and tb with ranged), he can scare demigods away with hammer slam. qot is great with support and can keep allies up with shield
so basically
first - no, it works fine, their moves are better
second - building kiling isn't their only roles, and there are other demigods that can do it pretty well(reg, tb, ub). it would limit strat if you had to have a rook or qot on your team