Chain weapons and psyker sword stun lock?

I can do massive single target damage when I use the strike down marks of the psyker blaze force sword or chain weapons to a lesser extent.

But my weapon locks on the enemy. Does this stunlock you and leave you open to damage?

If so, how do you adjust your playstyle around that? Or does it simply make those weapons unplayable for you?

I like my psyker Smite build, more fun than Brain Burst, but I struggle to have an answer for unyielding, ogryn, or maulers without the blaze sword mark with the lock on power attack...