I agree, 'no news (beeping) is good news' from a dive computer. However, if a person does do something wrong (none of us are perfect), a beep to let us know certainly does not hurt. In fact, it HELPS..... and for some divers, may be just what is needed to wake them up and make them pay attention. The alarms and beeps are there for a reason (as a reminder). If they are so faint that they can't be heard, then it defeats the purpose of having the alarms there at all.
We also should not speed in our cars. But, according to Dr.Mike's theory we don't need police to slow us down when we are 'in violation'.
If a fellow diver isn't paying attention, I'd rather that their computer beep at them, rather than having that person get DCS and ruin a dive trip for everyone on a liveaboard.