If you like the new, "mexico-sytle" trees, then yes. Yet I'm not sure, if this is the way to go.
Well, since Mexico was such an insignificant part of WW2, I don't mind them getting fantasy trees. Of course, I do not want a socialist German tree. Germany should have a historic tree only, I do not mind the Monarchy branch, even though I have never played it. I just want more variation for Germany.
The buildup should have more choices: get cheaper oil from the Sowjets (with huge benefits for them), improve stability after DOW just to name a few. The buildup of the game is too railroaded right now. Either you go totally against history or you take the full role-play history approach. I want more possibilities while keeping it historically plausible (probably not feasible, because of the damn multiplayer part and keeping it all balanced for MP). And I want more prerequisites for choices. This is what bugs me most about the National Focus system, it's just "click something, get something". Other countries' choices should be influenced by my own choices. I have been asking for interacting and interfering focus tress since before the realese of vanilla. It would be so awesome for the French and Brits to take several choices in reaction to German choices. Maybe unlock another branch if Germany annexes Czechoslovakia. Unfortunately it is tied to WT, but I guess it's too much of a task for the AI.
Also for the war itself there should be certain options. Why not have certain benefits for a Sea Lion operation? If the operation does not succeed in 45 days, then you lose the benefits (the enemy receives other benefits) and get disadvantages instead. Same for Barbarossa or landing on Crete. This would invite you to go for certain war goals at a certain time. You can still chose not to do it, but if you want the benefits, do it. Capture Paris within 45 days and receive a "discount" on resistance. Capture and hold Norway and receive a bonus for nuclear research (heavy water). Not huge, game-changing beneftis, just small incentives to keep things on track historically.