I would just throw more money at the problem not weaken the strength of my confidence in the underlying storage subsystem or the DB by playing with the fsync be

I would just throw more money at the problem not weaken the strength of my confidence in the underlying storage subsystem or the DB by playing with the fsync behaivor willy-nilly nor even in a calculated way. I would instead just throw more money at the problem by investing in faster and faster disks -- you can do a lot with enterprise grade NVMe now.