Again, if stun is considered an unfun mechanic by the majority of the community I'm all up for removal as long as BK is adequately compensated with a different feature that allows him to stay competetive and viable in 1v1 and teamfights, ideally making bk gameplay less frustrating and less based on luck - it has always been a character that lets the users skill shine, luck based mechanics are the antithesis of what BK represents.
On the other side of the coin, every single class bar RF doesn't have to deal with stagger while essentially almost permastunning BK in fights (if you happen to cyclone a DL or Elf and get under them you are effectively permastunned, maybe 1 in 10 fights I manage to get out of that positon), yet when they get stunned suddenly it's an unfun mechanic. As of now even with stun it's incredibly painful to play this class in 1v1s without fenrir. If you do decide to go full ref tank to survive group engagements without fenrir you're still unable to catch up to mounted people and stun them, I have yet to see an umounted ref bk in a teamfight have any sort of impact apart from being a hard to kill buffer. If he gets on you you just walk away, there is nothing he can do to catch you. Even if he had 1k attack speed and you are oblivious enough to let an unmounted bk walk up to you, he will get staggered from ref, making it impossible to keep a target stunned for long - just walk away.
It would be incredibly funny to see how teamfights will look like with no disabling abilities, ice ring +4 paired with potions of soul mean everyone will be unkillable and SM will become S tier . Perhaps buffing ice elf would fix this issue and give elf a second playstyle.