I think if you are overweight for your height you should try losing weight regardless. I wouldn’t hold off on taking finasteride due to a weight issue though personally
You make a good point. However you might have to find some studies that give indication to how much more / less aromatase enzyme is really produced due to changes in weight. More often than not it can be the case that some people just produce a lot of aromatase whilst others don't. If i were you i would want to be on the safe side and lose the weight first. I've just started finasteride myself and i made sure to get my Blood work done before hand so every 6 months i can check against my baseline on how my estrogen has been affected.