WHOA!
Winrate is based on hands seen per hour when wonging, and hands played with play all. Play all does not increase hands seen significantly vs. wonging, in fact it can decrease it.
Wonging helps winrate, lower variance, lowers n0 and should always be done if possible. It lets you bet more safely. And if you wong in and then play all, you get rated higher because you have a larger bet out when checking in, and may lessen heat because you appear to spread less.
Let me illustrate: I plan on spreading 10-150 on a shoe game. I can check in, buy in for like $500 and start betting $10. I look like a $10 bettor, and will get treated as such. Also, when I jump to $150 it looks weird.
On the other hand, if I wait for +2 or +3 and jump in with a $50 bet, I get rated as a $50 player, and if I jump to $150 it looks like nothing. If I drop back down to $10, it doesn't look like much.
So it aids cover, winrate, comps, etc. Wonging is fantastic, and should be used by everyone UNLESS there's a good reason not to.