/click -- why?

[Ualaa]

With multiple sequences, you can have variable reset conditions on a per sequence basis.

For example a Druid with Faerie Fire or a Hunter with Hunter's Mark could:
/castsequence reset=target Hunter's Mark, Null

In a click castsequence, with that as the opening sequence, you get one cast and then no more, until the target changes.

Our reset conditions are rather limited in sequences.
If we were to go Hunter's Mark, A, B, C, D, A, C, B, D, A, C, B, D, A, C....
Our sequence would automatically cast another Hunter's Mark on the not dead boss who is already marked.

We can reset based upon a certain amount of time, without any clicks on the macro.
Or with combat (ending), target (changing), or a mod key (pressed in conjunction with the sequence).

Unfortunately, we cannot use:
/castsequence reset=6 Multi-Shot,Null

As we are spamming the macro, and therefore never reach 6 seconds without having clicked the macro.
However, if we know our spam speed, we can insert the desired number of comma's to account for 6 seconds of delay.

Also, with click castsequences, given enough sources of replenishment and mana regeneration, our castsequences are effectively unlimited in duration. Which a normal /castsequence cannot always accomplish, unless we occasionally recast a dot which has not quite expired or hold off on casting a cooldown spell immediately etc.