"I refuse to get married because it has a hateful, patriarchal history to it, so I won't do that on principal. Why can't I have a civil partnership instead - just because I'm straight?"
So the government introduces civil partnerships for straight couples.
"I refuse to enter into a civil partnership, because it has a hateful, homophobic history to it, so I won't do that on principal. Why can't the government bring in something neutral so that we can legally declare our committed partnership and gain added legal protection and tax privileges?"
So the government introduces such a neutral institution. They can't call it the traditionally-understood 'marriage' nor the ronseal name 'civil partnership', so they need a new, entirely unconnected name.
It's 2022, and the new 'wibblediwoo' is introduced in law. It has exactly the same benefits and features of marriage and civil partnerships, and any two single adults can choose to enter into one, but it is somehow completely different, with a non-historically-loaded name.
"I refuse to enter into a wibblediwoo, because it's obviously the government assuming that we're stupid and trying to pull the wool over our eyes, when anybody can see that it's just a thinly rebranded form of patriarchal marriage and homophobic civil partnerships; so I won't do that on principal."
Fair enough: those are the three possibilities open to you, but they're all entirely optional and you're perfectly at liberty to remain legally unattached if you prefer. All good.
"But what must I do to protect myself legally, have my commitment to my significant other legally recognised and not lose my home to IHT if my partner should die? The government must urgently bring in some kind of official civilly partnershippy kind of thing, with all the same features of marriage and civil partnership - but something totally different so that it doesn't make me think it has any links at all to an institution with what I consider to be a hateful, unacceptable history - which it inevitably will if it's effectively the same thing."
IT'S ALL ABOUT MEEEEEEEE!!!!