RP had some arguments against conscious subsystems affecting moral weight very significantly that I found pretty convincing.
In regards to your first point, I don’t see either why we’d think that degree of attention correlates with neuron counts or determines the intensity of consciousness
I don’t think this is right. We could imagine a very simple creature experience very little pain but be totally focused on it. It’s true that normally for creatures like us, we tend to focus more on more intense pain, but this doesn’t mean that’s the relevant benchmark for intensity. My claim is the causal arrow goes the other way.
But if I did, I think this would make me think animal consciousness is even more serious. For simple creatures, pain takes up their whole world.