I've been playing this way since 5e came out, so I don't find it strange at all.
Regarding standing still to avoid detection while invisible, IMO that is a significant part of what the hide action is about. Even when they're trying to go unnoticed, there's no guarantee that they won't cough or sneeze or involuntarily flinch as an arrow flies a bit too close, revealing their position.
As to those who say that this makes rogues with Observant OP, I couldn't disagree more. To begin with the rogue used two limited resources, an expertise choice and a feat to get so good. He ought to be awesome at spotting things! Secondarily, he always spots stuff, so what? This gives him an opportunity to shine, so let him. He sees the trap, now he had to figure out what kind of trap it is and how to circumvent it. He sees the secret door, but that doesn't tell him what's on the other side (it might be a treasure room or a monster's secret lair). He notices the ambush, but he still has to find a way to deal with it, he's simply not surprised. Passive perception is not an end unto itself.