So your saying doing something else and keep my eyes away from water change for 3-5mins is not a responsible fish keeper? I just lost nearly 10k worth of fish and you think I wouldnt care about my fish?
I think he's implying that if you are that invested (serious keeper) then you have to take every precaution to keep your fish safe. Since it's not the water plants responsibility to keep water fish safe 100% of the time, its our job to make sure it is when we use it.