You don’t have to use heat in the BHO method. The only reason one would is if one is in a hurry. Nevertheless it’s still dangerous and silly to do it indoors with heating elements present, where even an high wattage light bulb can set it off.
It’s not done to make a more potent high, it’s done to make a more convenient and portable high by using it for edibles. It’s also used mainly for less than grade B marijuana — as the article describes it’s made from the chaff and stems of the plant ... which is silly because the stems will yield nothing but foul tasting Chlorophyll.
Naptha, everclear and 90% rubbing alcohol are also used to make “rick simpson oil” or “phoenix tears”. Some say it can cure some cancers. But mostly it is smoked