I want to narrow in on this, because this is the point I feel like that keeps tripping the conversation up.
You can't talk about changing what is, and not be able to talk about anything outside of what is. If someone is talking about redesigning silverware, and you say "there are forks, spoons and knives, and that is all there is, so I don't know how you can design beyond that" then you are shutting down the conversation.
Yes, we are talking about changing the default lore of Orcs in Dungeons and Dragons. Making something new. Maybe with a lot of the old pieces, there is good stuff there to work with, but the very process of changing something means that we have to look beyond what currently exists.
It doesn't matter that you can make an engaging and relatable fantasy world with the things that exist, sure, that's great, but you can make an engaging and relatable fantasy world with the new material too. Or you can do something else entirely. The point is what should WoTC put in the books. And, despite the decades and decades of DnD, despite the fact that there are DnD worlds without violent murderous orcs as the default, that default is what people see. That is all that is in the MM, that is all that is in the PHB, and that is all that is in Volo's Guide. Which, while the old guard might see Volo's guide as setting specific, the newer players who don't know that Volo only lives in the Forgotten Realms, don't see it that way. They see Volo's and Mordekainen's as general books, not setting specific.
So, I don't think can just expand the sidebar saying alignment is optional and put non-violent orc options in the DMG. Not if we are going to have Half-Orcs in the PHB. We need to go beyond what currently exists if we want to change what currently exists, and there are more than a few of us that want that for the game.