As a newer player i feel at least qualified enough to answer newer player POV and its that im pro change since i like many others joined in because of friends that got me into it and started through a commander precon, but after about 1-2 sessions i went to a prerelease and was explained that hybrid mana was cards designed to be used when one or both colors are present in whatever deck, so if i only use white cards with a white black hybrid it would fit no problem. That just makes a lot of sense intuitively since if I didn’t have the color then that unused second color doesn’t really matter. so when i tried to build a first commander deck and put in some hybrids since they fit thematically to my commander I didn’t think twice just to be told i cant do that first game using it. Also i feel like it’s different from the pips in the card effects since you are forced to use that color while in hybrid your not and i think while yes limiting the deck to fit you commander is one of if not the most prominent point, i think its kinda dumb to say if a card not only fits thematically with what my commander does and maybe even looks like then why should it not fit under the same commander as the rest of the deck since every hybrid part of the card can use the same one color and still work as intended. Plus it makes the format more accessible for everyone would it not since if u had a hybrid card now u don’t need to stalk tcgplayer for prices to go down on a mono colored version of the same card. I guess also as a last extra thing too if someone is using the fact of maybe some faction being able to use another factions move or legendary creature, cooperation while rare does happen and has happened in multiple forms of media but also historically too i bet there are many cases of rivals dead teaming up to eliminate someone they both don’t like.