Thats not how you count it, because tyrant AoE skills are mostly about P atk, hell, good players learn only very first lvls of those skills and dont waste more SP on them to save it for other skills while they have low MP consumption, while dmg is very comparable with maxed lvl of skill with same equip Not to say every second train you can lower yourself to use zealot which gives you 50% clarity effect on skills, so you barely waste mp to kill those trains
Overall, since destroyer normal AoE (auto attacking while vamping everything back) is not really common way on classic anymore (and its kind of hardly doable), tyrant is one of the best AoE classes in game