I dont get the point of using any concentration spell on a tank.
Tanks often have good AC meaning they get hit less.
Honestly, it's not particularly difficult to maintain concentration on anyone besides a Barbarian (Due to the obvious nature of Rage preventing concentration).
Even more so when you factor in using CC abilities to give enemies disadvantage on attacks, or simply outright kill them so they can't attack (Which is what Haste can allow you to do) and the various ways to gain bonuses on concentration saves (Items to give advantage on Con checks, items to boost your Con massively etc)
