> When my RSUs at Google vested they would automatically sell some to pay my tax obligation, but I would instruct them to sell half as well. Same philosophy. Get some of the money diversified, keep a bit of skin in the game in case it had a gain.

There is no difference (except for a few bucks in broker transaction costs) between doing this and selling ALL of your RSUs as they vest ie "auto-sale" and buying Google shares on the open market.

Although the latter emphasizes the decision you are making to concentrate on a single issue rather than diversify.