My humble opinion is just for your reference.

Endometrial polyps are almost always benign, hardly become cancerous. You don't have any clinic symptons, such as, irregular bleeding, I guess that's the reason your canadian doctor suggested you not to take a treatment at this moment rather wait and see.

However, you stated that you didn't have kids. If you do want to have kids, and is planning now. The removal of your endometrial polyps might make more sense. Because the polyp is not a positive existing factor for your pregnancy.