I watched already. I somehow figured he wouldn't be very much into the Discord stages, but I'm glad he enjoyed the bosses so much anyway. Looking back, I think the biggest reason the Discord stages failed so much (at least under his standards) was because I decided that I wouldn't introduce many (if any) new elements through the final stages, but to instead test players on all the concepts learned through the main stages and mix them together. There may just not have been enough unique concepts and enemies in the main stages to pull that idea off effectively, and that led to each stage feeling themeless more than anything else. Plus, the fact that I fully expected the player to use weapons and how he doesn't like that. I don't necesarily agree with the idea that they should at no point be mandatory considering it's impossible for you to be missing one, especially since it actually plays along with the fact that in Mega Pony, weapons regenerate after each stage.
Either way, for someone that has some pretty negative opinion on even some of the major numbered Mega Man games, I'm surprised (and a bit proud) he found that much enjoyment out of Mega Pony. I'll definitely have his critique in mind once I finally start properly designing Canterlot.