I doubt if practicing the MOB-maneuver belongs to the most important things when sailing.

Using the life lines in all situations the sea is not calm is much more important.

Beside this in my opinion life lines are one of the most important security things on board and much more important than most other stuff like life jackets etc. although many people don´t use the life lines.

If your are only two persons on board I can´t imagine almost any situation you need the MOB-maneuver.