The focus is not really on the "commercial" part of it but the part where I don't necessarily have to do everything from the flower stage. In a similar vein, I don't think that Berliners and Barcelonians are churning their own butter because there isn't a shop selling butter already made, or knitting every sock they own because nobody sells socks. The US marijuana sector isn't even really heavily commercialized, there are no major regional or national distributors or sellers of weed, but you can buy products made from flower all the same.

The smell from making my own edibles in an apartment would probably not endear me to my neighbors, and sometimes I would rather use an edible than roll a joint.