[Timothee]

Based on the way the article is phrased, it sounds like removing these makes things feel simpler and less bureaucratic.

In more details: not having a parking barrier means you can just drive in the lot without stopping your car, opening your window, scanning your badge, putting your badge away, starting your car again just to stop just after in a spot. I don't know where Yahoo! HQs are but I'm guessing they are little use to check who is parking on their lot. So what does that change for employees? It removes one useless step in your morning routine.

Turnstiles are similar. Turnstiles are a bit uncomfortable and unnatural. If you can remove them, it just simpler. I doubt they just let anyone in, but you can put a couple of security people, a badge scanner and you're good to go. I know Facebook has something where you just badge and walks through without having to push a hard metal bar with your leg, hoping it won't catch your gym bag.

I'm skipping the steps because you stopped too far from the scanner