Actually something is occurring to me. The demo sort of thing we got kind of implied that we'd be able to do this starting from act 1. But strictly speaking it only (I believe, I could be wrong) showed us collecting a tadpole from the dwarf guy, then cutting to the brain screen. So what I'm hoping is that the screen is actually something we only deal with late game, and we can just collect tadpoles throughout the prior acts. It would make sense since this is supposed to specifically address late game slow levelling. So maybe by the time we're able to do this we'd be at a stage where are character could reasonably not be prioritising getting the tadpole out. Which would male a lot more sense.
Why would we go around collecting tadpoles without a reason instead of ignoring them/killing them?
My guess is the first time we encounter another tadpole we'll get some sort of cutscene where our own tadpole urge us to consume the other tadpole to increase our power or something like that.
Yea, there absolutely must be a 'good' reason why we're encouraging the tadpole. I'm just not convinced that the reason will feel logical in any sense. I'm dreading that it will be another Withers moment, where everyone just sort of accepts them for reasons, but gameplay wise it's useful.
I have my doubts with Larian's writing, but they will acknowledge it somehow.
