I have disabled YouTube Watch history and I really enjoy seeing YouTube struggle to provide me anything meaningful in the Home feed. Most suggestions are just based on my subscriptions and I see a lot of repeated suggestions as it doesn't know what I have watched.
This keeps me away from the echo chamber that it creates for most people.
An echo chamber propagates the same idea through various channels making it look like the echo chamber is the only truth.
My subscriptions stay limited, no every creator creates the same video again and again, once I watch a video I am not going to rewatch it and get another new idea which solidifies the idea.
So I would argue that it isn't creating an echo chamber.
This keeps me away from the echo chamber that it creates for most people.