Things don't get to be banned in Vintage unless they totally whack-out the game. The "at least three feet" cards involve physical dexterity, Shaharazaad involves playing an entire game-within-a-game just to determine half of someone's life total, and the ante cards turn it into irl gambling. The only card that one could imagine being banned in Vintage, but isn't, is Goblin Game. (Not saying it should be—it essentially says "secretly pick a number"—I'm just giving an example of what I mean by "whacked-out.")
No amount of overpoweredness, unweildliness, or liability to break the meta in half, has ever gotten a card banned in Vintage. That only happens if a card turns a game of Magic itself into more than just a game of cards.
Lurrus is certainly OP, but so is the Power 9, and the deckbuilding peculiarities that Companions bring to the table have certainly never stopped things like Wishes from being Vintage-legal, either. Every card that would be banned anywhere else, is simply restricted in Vintage. That's kind of the whole point of the format.
They specifically released a statement basically saying that if they needed to ban something in Vintage, they could.
They then went on to announce that there would be an update to the banned/restricted list for Vintage, Legacy and Brawl (the statements may have been the other way around in order, but result is the same). They wouldn't have done that if a ban was not on the table.
The important takeaway from this:
Cards that are banned in Vintage are not legal in Commander.
I don't understand - where did you get that takeaway?
"All cards banned in Vintage are banned in Commander" is not part of the rules or ban list. All cards currently banned in Vintage are also banned in Commander, as far as I know, but (other than the ante cards) they are all banned on an individual basis. https://magic.wizards.com/en/content/commander-format
I haven't seen anything from the Rules Committee suggesting that they would auto-ban anything that got banned in Vintage, either.
It wouldn't be banned in Commander, it simply would not be legal. Commander uses the Vintage card pool, if a card is banned in Vintage it would simply not be legal in commander.
I wonder if they ever considered making the Companions start in the Command Zone. Then, if they got to be a problem in a given format you could just say that the Command Zone couldn't be utilized in that format.
Problem with that is that emblems exist in the command zone, would have to be an entirely new zone.
They specifically released a statement basically saying that if they needed to ban something in Vintage, they could.
They then went on to announce that there would be an update to the banned/restricted list for Vintage, Legacy and Brawl (the statements may have been the other way around in order, but result is the same). They wouldn't have done that if a ban was not on the table.
UBBreya's Toybox (Competitive, Combo)WR
RGodzilla, King of the MonstersG
-Retired Decks-
UBLazav, Dimir Mastermind (Competitive, UB Voltron/Control)UB
"Knowledge is such a burden. Release it. Release all your fears to me."
—Ashiok, Nightmare Weaver
It wouldn't be banned in Commander, it simply would not be legal. Commander uses the Vintage card pool, if a card is banned in Vintage it would simply not be legal in commander.
UBBreya's Toybox (Competitive, Combo)WR
RGodzilla, King of the MonstersG
-Retired Decks-
UBLazav, Dimir Mastermind (Competitive, UB Voltron/Control)UB
"Knowledge is such a burden. Release it. Release all your fears to me."
—Ashiok, Nightmare Weaver
Problem with that is that emblems exist in the command zone, would have to be an entirely new zone.
UBBreya's Toybox (Competitive, Combo)WR
RGodzilla, King of the MonstersG
-Retired Decks-
UBLazav, Dimir Mastermind (Competitive, UB Voltron/Control)UB
"Knowledge is such a burden. Release it. Release all your fears to me."
—Ashiok, Nightmare Weaver
Cards that are banned in Vintage are not legal in Commander.
UBBreya's Toybox (Competitive, Combo)WR
RGodzilla, King of the MonstersG
-Retired Decks-
UBLazav, Dimir Mastermind (Competitive, UB Voltron/Control)UB
"Knowledge is such a burden. Release it. Release all your fears to me."
—Ashiok, Nightmare Weaver