.
I [in]famously wander around a topic when I post. That is, I take note of the OP's intent, but usually pick an interesting aspect of other topic directions put forth by prior Posters.
On other Forums, this can really hack off *Question -> Answer* types who view wandering off-topic as some mortal sin. I just let that sort of rigidity go because nuancing around a topic often stimulates insight.
If the OP topic merits a direct sort of answer, I've been known to address that head-on, too.