Boat equipment, from engines to simple fastening screws, are poorly
made and lacking in quality control.

If aircraft had failures only one twentieth as often as boats, both
sail and power, the loss of lives would ground all commercial airlines
and private planes.

My last new boat (expensive), from a major and long time manufacturer
of reputed high quality craft, and only the best rated equipment,
within the first year:

port engine -- fuel pump failed once
port trim tab -- hydraulic pump failed once
engine synchronizer failed once
air conditioning in saloon failed -- compressor needed replacement once
bulbs burned out twice in both port and starboard running lights
generator failed to start three times and to run more than an hour in
two instances (plenty of good fuel on board)
SAT TV failed and required new chip board once
other failures, less major, but still important to safe and dependable
operation