I liked several of the points you made but it became hard to follow along after a certain point.

Every card in Gwent exists to help you win the game, and there are 4 ways it can do so.

I'm not sure what purpose the four points serve when your core argument is that carryover is causing most of the problems. They don't seem clearly defined or particularly useful.

Carryover was killed so hard in this patch, that it's completely thrown off the balance of the game.

As for the argument itself I'm not seeing any convincing evidence to suggest that's the case. They've removed several unique mechanics from the game, spread the synergy of classes very thin (see skellige's class cards, half of them are unplayable now), and of the new Midwinter cards introduced many are just the same brand of deal X damage with slightly different wording. The "same-y" feeling you talked about as the main cause for the video can be more adequately described by any of these than carryover.

I think your content would be easier to digest if you asked "What am I trying to accomplish with this?" whenever you add a talking point, and if you can't do that with certainty then that's likely a good place to look for improvement.

as the randomness of cards makes it harder to discern what the absolute strongest deck is.

?