Do SMN and BRD need 2 DoTs?

[SaberMaxwell]

There is no opportunity cost, all actions are equally likely to generate a RA proc and an early IJ would only be useful to cast more Burst Shots, to which I just proved that losing 2 ticks of a dot is not worth.

You'll need to show me more than 2 gcds of math on that. I'm a layman.