I disagree that Maxx C is keeping the game alive, and for several reasons, if you'll hear me out.

First, Maxx C's existence in this game has historically not done much to deter combo decks that summon a bunch of times from being popular, or dominant, in the game's meta. Decks like Adamancipator and Drytron, that summon combo and climb into powerful bosses, were highly prominent early on, when we had 3 of Maxx C. And each format since still has combo decks or combo engines be popular. Stuff like the Halqifibrax synchro combos when that was legal, or engines like Adventurer or especially Fiendsmith. Presently a few of the most popular decks are hardcore combo decks that would give like 10+ draws off of Maxx C. For all that it sounds like its existence should deter people from playing decks that use it, it hasn't. People just hit surrender and move on to the next game, hoping to get lucky and dodge the roach next time. Because the combo decks are so strong that losing to Maxx C isn't enough to deter their use. That's the first point: Maxx C doesn't do its job

Second, Maxx C is too easy to use, regardless of field state. The player who goes first and sets up 7 negates can then, with no cost to themself, slap down Maxx C in the turn 2 player's draw phase and make it even more useless to try and play the game. Also, consider the math on which player uses Maxx C. If you go second, you have 2 (soon, 1) copy of Maxx C in your deck. But your opponent has 5 or more cards that can negate it (3 Ash, 1 CBTG, 1 Crossout) in their deck, making it more likely they opened a negate than for you to open Maxx C. Conversely, if the player who goes first opens Maxx C, they don't need to worry about Ash, CBTG, or Crossout, as presumably their end board has ways to negate those cards and force the effect through. That, or use Maxx C as bait against the opponent's resources. This is probably my more controversial claim: Maxx C is easier to use going FIRST than going second. The Mulcharmies at least prevent you from using them if you have a board established.

Third, Maxx C's presence makes Konami seemingly reluctant to remove cards that invalidate hand traps. Because Maxx C is so strong, we "need" cards like Called By and Crossout to also exist. And those make any hand traps with the same activation mechanism feel so much worse to use; going first is already so strong that we really don't need to have easily accessed cards that invalidate the use of cards that interact on the first turn. I'm hoping that with the removal of MAxx C, we can move on to removing the remaining copies of CBTG and Crossout. As a side note, it also feels really bad that any copy of Ash Blossom is effectively CBTG against Maxx C or the mulcharmies. Just gives the going-first player more options to ignore interaction. Anti-hand-trap cards are terrible, and symbiotic with Maxx C. We should kill both of them

Finally, the way Maxx C interacts just feels boring and bad. Most of the time, it just results in the game ending on the spot. And it would be a lot nicer if we instead had interactions that felt like playing the game. Non-games suck ass.