Afaik, /click gets stuck at the exact same spots /castsequence does.

E.g. if you have 3 buttons with:
/castsequence Flameshock,,,,,,,,,,,,,,,,,,,,,,,
/castsequence Lava Burst,,,,,,,,,,
/cast Ligthning Bolt
plus a spam macro to /click them in this order.

Then, if you spam too fast, your /castsequence Lava Burst,,,,,,,,,, will wrap around back to Lava Burst before it is off the cooldown, and you will be stuck waiting for Lava Burst to go off cd, with no spells (not even lightning bolt) firing.

Since this method is largely dependent on timing your clicks (player skill.. of sorts) to produce optimal results, I doubt they will work hard to kill it off.