* gdscript is not python, it's lacking several small python things that makes python awesome: list/dict comprehension, .items(), sets, although gdscript is quite enough and still quite a good language for game dev as it does just everything well, especially for natives types etc.
* I tried gdnative and I still need to try gdextension, but so far writing C++ for godot seems quite hairy and the programmer must use godot types and "new()" everywhere, which is not really easy to deal with, so godot is not really a C++ engine, C++ is only usable if you want to optimize something a bit tedious, which is fine, but important to remember, and it confirms the whole "use a scripting language 99% of the time, and use C++ only if scripting is not fast enough"
* I would still want to inspect the real potential performance of gdscript compared to other languages, and I don't know if mono/.net is faster. It seems like a very good language especially because it integrate perfectly with how the environment is designed, but I'm still curious if they plan to improve it.
* I'm planning to make a multiplayer FPS game, but I don't think godot provides network prediction, and I wish it did.
* I'm a bit worried about opengl support in the future, it's not entirely done yet, and I'm afraid it's too difficult to properly implement because new API like vulkan or DX12 are so radically different.
Overall godot is the greatest thing that ever happened to open source and game development, game development is one area where open source has trouble making its teeth, and the lightweight design of godot makes it just such a big relief when you compare it to monsters like unreal and unity.