Blender is a lot older and has a lot more professional investment and interest behind it. I don't doubt Godot could be in a similar state of quality given as much time and effort, but I don't think it's there yet. With open source, contribution quality is often a function of popularity attracting contributors with the necessary skillset being willing to put in the time and effort, usually for free.
This isn't meant to be a slight against open source, just an acknowledgement of the tradeoffs of an open development model. Something like a game framework or model editor can't reach a certain level of maturity until actual professionals in the field care enough to contribute, because of the knowledge gatekept within those industries, and their expertise. Most free software contributors will necessarily be amateurs and hobbyists, and that will likewise limit the quality of the end product.