I mean it's a relatively young open source project. It took Blender 25 years to get where it is now and it still has some major flaws compared to the paid competition, and will need extensive rewrites if it wants to move forward because right now the C part is a horrible mess.

Godot isn't going to compete against Unity or Unreal anytime soon. Godot's team doesn't have billions at their disposal like Epic or Unity.

edit: Blender also had major advantage aside from begin free, it could do physics and volumetrics for free when the commercial competition required yet another paid plugin just for that stuff, so why pay when the free solution does more than the competition? and let's not even go into requiring separate paid rendering engines for the renders to look decent...