No problem at all.
while I do not understand why we heed all these edges in the ends of stem, I removed them even at the previous stage of modelling. Any time I can recreate them using ‘I’ functions on ending faces of stem.
I did the same thing. I deleted all the faces at the bottom of the hole, then filled the edge loop as a single face. Duplicated, scaled down a bit, then extruded up. I did the same with the bottom of the lamp, deleted all the faces, filled the edge loop as a single face. Maybe this will cause a problem later but right now it seems like I just knocked a lot of unnecessary faces off for rendering.
After seeing rendering times in previous lessons, I’m getting real conscious of how many faces there are to render and look for ways to cut them back.