As an example of a game that makes me want to puke.
I'm on the draw.
T1: they Gilded Goose. I play land and pass.
T2: they play Oko, make a food. My hand is land, Leafkin Druid, Brazen Borrower, Hydroid Krasis, Oko, some other stuff.
I haven't lost, but I sure as hell didn't feel like playing, and conceded. Next game.
I'm on the play.
T1: I play land and pass. They play Arboreal Grazer.
Oh yeah, this matchup which I pretty much can't win in game 1. I concede.
Well, for game #1 you're maybe too used to your Nexus deck that made you ignore whatever the opponent did so the only thing you ever feared/disliked was a blazing fast start.
Now that your deck features Oko + Goose too, you know that this starting hand can happen, but doesn't happen all the time - far from that. I know because I've had the same deal with Llanowar Elves into Steal Leaf Champion. But I always consider that a nice thing, whether it's for me or for the opponent. It's okay to lose to that - for me. Also, not everything is lost even after that start - though yes, I am also one who concedes early and often when a game only has a << 50% chance of winning.
Game #2, sure if you play rock and he plays paper, that's okay if you're going for max time efficiency, but don't get upset at that cute little tree guy
What triggers me is oppressive **** like Thought Erasure or counters in general. I don't want to ask permission in my leisure time and I don't want to trade my best card for a stupid 2 mana card with two additional bonuses.
So Veil of Summer truly is a blessing.
As for Gwent, yeah, what you describe sounds like it's not 10% as complex as Magic.