AI of Heroes is ... weird on purpose or?

Just curious, are heroes on purpose a bit.... de-buffed or is it a technical difficulty?

What i mean is, what is the reason heroes dont spam skills but it takes a looong time to recast some skill even if they are at max energy n theirs no reason not to. Also, what is the reason sometimes heroes do cast some skill, but sometimes also in combat they dont, considering it's a generic n not special skill (doesnt depend on enemies)? What is the reason that sometimes MM hero doesnt use BotM at all and sometimes spams it in a row few times until he dies, even though there's really no need to cast it that many times? What is the reason some skills are not used in 10min and suddenly both heroes use them? The enemies r same, they did have max energy etc.

Is this simply a technical issue, or do they act stupid because otherwise they would be "overpowered"? (which makes no sense as they are there to replace players and not Isle of Nameless dummies)

They have some minor AI problems, I assume that anet will resolve them before HvH tournaments.

English, it's not just for breakfast anymore.