Boss stun immunity vs unaffected

Hi,

I was wondering whether it wouldn't be better to make bosses unaffected by stuns for 4 seconds but still allow the stun to happen regardless of effect as not to break builds that rely on on-stun effects (eg endurance charge generation through Endurance Charge on Melee Stun).

Wouldn't that be a less intrusive alternative ?

Or am i missing something ?

Thanks