It is true mount Traits right now completely break MP balance, but they are still cool as hell and should be cherished.
Honestly, the argument of calling them a bad idea just on the basis of they being hard to balance is weak, the game is too vast to be constraint on these notions, if you're talking about what need to change to achieve a balanced game we would go on a list bigger than the old cosmetic forms threads, and in their those guys were talking in circles for months on end.
In truth the best way to tackle such concerns it to identify the big offender of these, which are again heroes and the unicorns, but that is because the ability to phase in heroes with a stack of 48 mov is just that strong, even if tomorrow we delete those traits we just go down the list of the next big thing, so i say, the only true path is to keep shaping the game slowly to accommodate balance as much as possible.
Also in terms of the topic, i don't think a lot of those points are valid tbh, a lot of these concerns are pure nitpicking of random mechanics in the game that is taken seriously by 1 or 2 guys and that it, i still think this AoW 4 is the best in the franchise BY FAR, and i played all of them religiously, and this game will only get better simple by the fact of how it was build, the skeleton may look rough initially, but the potential is immense.