Because its the same thing as asking "what type oil do you use in cars?"
Not exactly. Motor oil in cars are very similar except for the different viscosity you can choose. Lubricants for ratchets has a very broad spectrum because of the extreme differences ranging from oil to grease. And each type of lubricant will effect a ratchet differently.
On sealed ratchets, some lubricants will even cause the seals to swell up to the point that reassembly is impossible when reinstalling the seals. With high viscosity wheel bearing grease, the gear pawl will have a tough time engaging with the ratchet gear as evident by the absence of the familiar clicking sound.
And then, you'll have one single ratchet that works differently with different lubes. From my experience with trying different lubricants on different ratchets, my conclusion is that having a universal lubricant for all different types of ratchets doesn't always work best.
It's best to match the lubricant to the ratchet. And only by trial and error will you figure that out. I've already don't all the trial and error experiments with my ratchets, so I'm done with it. For example: I've got it figured out what works best for a Snap-on sealed ratchet and what works best for an unsealed MAC ratchet.