Following left main bifurcation stenting, do you routinely proceed with kissing balloon inflation of the side branch, either LCx or LAD?

It depends on the technique used; most crush based techniques require kissing balloon inflation.

Simple answer, yes. Complexities exist that could modify the approach, but in general, ensuring the bifurcation is maximally dilated is my preferred technique.

Yes

It is ideal to do it. Sometimes, however, it may not be feasible.

Most of the time but again depends on lesson and which technique I used.

Ideally, yes.

The answer is yes. One must do kissing balloons after complex LM bifurcation stenting unless it is technically not possible.