No flips for you!
I would say that this not being the default leads to far more absurd situations. I mean, maybe you're locking down on default? That just means that this is what happens unless something bumps it, which has been my position throughout. The default isn't inevitable or required, it's just what happens normally. If you don't think that it's the normal thing for creatures to notice other creatures, I guess we can talk about that, but it might be weird.Except it is not. People keep saying this but that is completely made up and would lead to countless blatantly absurd situations.
Sorry, but does this address something I said? You seem to be trying to refute something I said, but I can't for the life of me understand what this disputes because I agree -- this is what the spell says.Invisibility say that the creature cannot be seen. That is not mere fluff. Whether exact location of something can be pinpointed automatically, with some difficulty or not at all depends on may different factors. This game has a human being in charge to adjudicate such factors.
Also, knowing the location of a creature means you can approximate where it is within a five square foot area. I dunno about you, but that's not particularly precise at all. Which is why you get disadvantage on trying to attack the creature you only know is in that five square foot area. We aren't talking about knowing that you're exactly there, on that spot, eating an apple.