Well said. Your comment reminds me of a conversation from 30+ years ago with a work colleague who opined - or shared the opinion, I cannot remember which - that our "input bit rate" was fixed. Young and argumentative, I disputed this, but....

I don't remember all of the arguments in favour, but he pointed out reading: We start sounding out individual letters and eventually progress to scanning whole words or sentences or paragraphs.

It's not that our bit rate changes, it's that our "bit" changes.

Yeah, handwavy I know, I am struggling to recall the conversation.

Essentially, though, consider your point another way: We can only process so many concepts/notions per unit time, and initially, in any subject, our concepts/notions are smaller. As our experience grows, they grow, so our throughput increases, even at the same processing speed.

Sort of like widening a highway to handle more volume at the same speed. Sort of.