It actually IS an argument for it. The risk of going to 0 hp, especially when full or near-full, at a time when you know it might happen more reasonably (like a BBEG critical hit) adds excitement to the game.
It hardly ever happens as it is, so having a bit more of a chance of it happening increases the tension--which is part of the fun. So, yep, another argument for more of that.
And many wouldn't when the odds are so extreme. So... so what to your so what?
A PC might normally take 15 damage from a crit but takes 30 instead and is suddenly out of the fight for the moment!? Now the situation is more dangerous and the players have to work harder with the increased challenge.
And when a character takes out a stronger foe when they get really lucky, the group remembers it.
I mean,
@Xeviat gave you a like on that post, so agrees with you it seems, so I'll let it rest, but I know a lot of players who enjoy the drama that our critical damage creates. And they idea of allowing dynamic criticals to explode will create a similar tension.