You should be but if you don't have the timing down and it's a dodge-heavy fight, it might be safer not to use them.

And then there are fights like Ifrit HM for instance or Diabolos where you want the boss to only build stun resistance when necessary (3 stuns per minute, after that they're immune till the minute from the first stun is up), so Spineshatter is right out the window for those situations.