It could be because he actually understood the coin flip advantage. By itself coin flip was a minor advantage because the player going second could play more reactively. If you knew what cards they were playing, or what they were probably playing given all the available information (leader, cards already played, when they pause to make decisions, etc.), it wasn't such a huge problem. It only ballooned into a huge issue because of abuse getting paired with it.
But the coinflip abuse WAS the issue, it was so easy to get an advantage out of it and reduces the game's design way too much.
You have Broover + Clever after you won the coinflip, you win the game.
You have a silver spy after you won the coinflip, you win the game,
You have a wardancer after you won the coinflip, you win the game.
You have any form of carry over after you win the coinflip, you win the game
...
I could go over and over, this system was clearly the most problematic aspect of the game and I'm far from being the only one to have this opinion, many other players agrees including a lot of top players.
This is part of my concern. I don't think they have done a very good job of adjusting the game, ever. It's an opinion and a harsh one but it's the truth
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This isn't true, in fact CDPR proved many time that they're competent at balancing their game.
Remember the PFI, Radovid control, invincible gold trebuchet with permanent resiliency, the Foglets, 3 points per turn Gold weathers ect
They fixed all those issues perfectly well.
The problem with CDPR isn't their unability to fix their game but their bad habit to change the game from A to Z (because, peoples talk about HC since it's the most "extreme" change they've made but this isn't the first time they change all the cards and all the mechanics altogether) and while, as an artist myself, I understand their feeling (yes, it often happens that you have an idea that you think is better than what you did before and end up changing everything you've made) I think they need to stop doing those kind of massive change and stick to what they have.
The problem when you always change everything is that your game is basically in a permanent beta state which is humanely impossible to balance because their is way too many new things that are going to interract with each other every single time.
But I think they learned that lesson and they want to stick with what they did with HC. They chanced everything one last time so the game is closer to what they wanted and now they can start improving the game by fixing the issues as they show up. The reason why I think they're in this way of thinking is the fact that they released the game with HC and the provision system (which allows for more flexibility for balancing the cards without changing their effect).
We will see I guess but if they stick to what they made now and stop changing everything (it doesn't mean they can't rework a few cards here and there) I trust them for doing a good job at balancing the game.