I think you have covered a lot of them dude!
I too really miss the weather synergies! Hounds spawning frost, and foglets appearing with fog fit thematically really well!
I disagree regarding the crones however! You absolutely have to play them together as each one gets stronger when another has been played. I honestly prefer what they have done with the crones than the current Witcher trio which is a lot more basic in comparison, and again thematically, they are witchers, they work usually alone so it doesn't make much sense to have them all appear together!
I too really miss the weather synergies! Hounds spawning frost, and foglets appearing with fog fit thematically really well!
I disagree regarding the crones however! You absolutely have to play them together as each one gets stronger when another has been played. I honestly prefer what they have done with the crones than the current Witcher trio which is a lot more basic in comparison, and again thematically, they are witchers, they work usually alone so it doesn't make much sense to have them all appear together!