Do any you guys actually use TDD in making your game or do you just yolo it?

Furthermore about the design of your guys code. I've essentially been routing everything through a massive event bus. I have a manager and a controller for just about everything. I think this is as decoupled as it gets. Nothing can effect each other. I have some insane 3 system finite statemachine to handle posture,air, locomotion and hell im working on a fourth which handles combinations of those three for like slide (posture +locomotion)

For objects I have a system which collects all children into a format that my UI controller can display happily
The children I treat as components so which lets me just drag and drop scripts to compose an object

Are these good design choices? thanks anons