So, just my 2c, there are two big reasons to defoliate. Airflow, and having a multi plant grow where the canopy stops light from reaching anything other than the top of the plant. Bit of an exaggeration maybe but you get the idea.
That looks like a fairly small plant that isn't competing for light. I would maybe take off leaves that are directly covering flower sites but aside from that I'd leave it. Maybe clean up the bottom a bit.