Ratchets are a good thing.

I like the ability to turn-on or turn-off the ratchet for the main sheet system. I want to know when and how freely the sheets will run through the main blocks. Spinnaker sheets are a bit different and the auto ratchet is good for that job.

Light winds - Ratchet off so the sheets feed out smoothly.

Lighter crews or single handed sailing - Ratchet off. The boat may fly a hull to easily or capsize if the sheets do not feed out smoothly.

Moderate to higher winds with enough crew weight - Ratchet on. This holds a large portion of the sheet load which is much easier on your hands. Less grip is required.