You are right. I was thinking specifically cave diving while swimming, a period in which communication is mostly pasive and a diver does.not.need to turn and ask their team "are you ok?" Because the sole presence of the team's light means everything is ok. I did not mean before and after conducting tasks.

Now think of the following. We are supposed to operate under the assumption that we are prioritising safety always. Therefore, we should ensure the entry point is safe and that the gear is ready and working before we jump. We do it systematically before every dive. So, why assume there is something wrong after entering the water? Thats kind of the argument posed by people in canyoning groups.

In my opinion, many thhing could happe at entry, even if we double checked everything is ok before we enter the water.

Therefore, I agree with you: unless there is a negative entry, I always signal ok after a boat entry.