Of course, that doesn't mean that products will interoperate, right? If you have been in IT for any length of time, you've witnessed the finger-pointing among vendors about how a competitor's product doesn't conform to the standards while theirs does. In many cases, both vendors are right and wrong.
Any useful standard is likely to be pretty complex. I know that the people who staff the standards bodies work diligently on developing standards and nailing down minutiae, but there is no way to predict all of the possible interpretations of the standards documents. Often times, the confusion is over little things like field interpretations or process flows, and depending on how you read it, you can implement the standard in different, but valid, way.
How does this get resolved? One way is with plug fests. Getting the implementers and engineers in a room where they hook up gear and see what works and what doesn't. Then they ferret out the root cause and figure out the best way to resolve the problem. If all goes well, these problems get resolved and everyone agrees to the same interpretation of the standards and that gets fed back into the product development process. That's what is supposed to happen, at least, but it doesn't always. There were plug fests for IPSec testing, but trying to get vendor A's product to talk to Vendor B's product (I was doing this way back in 98 when IPSec was all the rage) was an impossible task unless the vendors did specific interoperation work outside of the plugfests.
We were destined for the same outcome with Wi-Fi, where various vendors would interpret 802.11 specs differently and the products from different vendors wouldn't work together. Until the Wi-Fi Alliance was created to perform interoperability testing and a logo program demonstrating significant, functional, interoperation. The Wi-Fi alliance didn't create standards, they just became the defacto interpretation of the standards. The resulting interoperation between vendors demonstrated through the Wi-Fi Alliance logo program is what allowed Wi-Fi to grow astronomically.