I see your point, but it’s still weaker than one on one. Much more vulnerable to mana problems, or any kind of poor shuffle really, since that quickly turns into 2 on 1. And you can’t feasibly do best of three due to time constraints.
In any event, I concede the point that multiplayer is a paper product in this space. If someone has an epiphany and makes a great digital multiplayer experience, great, but I won’t be holding my breath.
But I don’t much care about online multiplayer. Good one on one, or even PvE, is what digital TCGs are for as far as I’m concerned. And games like Eternal taking advantage of the digital format is a nice innovation that I’m happy to see.