Is fsync needed for every write in all projects? I am willing to trade database speed for the loss of the last written data within a 1-10ms window once or twice

Is fsync needed for every write in all projects? I am willing to trade database speed for the loss of the last written data within a 1-10ms window once or twice a year for non-financial and other non-critical data. So, power loss shouldn't be such a frequent event when there are active transactions at that moment, right?