Thinking does not seem to require objects (real things, I mean)—all it needs are subject matters. Thinking as such cannot establish whether there is an object out there.
Action needs a way to assess objects—it seems perception provides that way, rather than (or next to) thought.
If I throw something at you, how do you know whether to duck, ward-off, or catch it?
If it isn’t objects that you perceive, but colours and forms, or, even, sense-data, then when will you know what to do? Which processes are required for your insight (in the nature of the whatever that is coming towards you) to surface?