From a software development and deployment standpoint, when I'm looking for "Who do I send new stuff to first?", opting in to be cutting edge is only part of the equation. Depending on what my focus is, I'll look at other factors from available data points. Those aren't going to be apparent to anybody outside folks who made the criteria. Anything could affect it, from how fast you accept updates, to the speed of your WiFi, to your driving habits, to the color of your car, to the ambient temperature. We have no way of knowing.
Opting in is not "Priority in line". It's an offer to accept something that may break your stuff. So while opting in simply says you're willing to take the cutting edge, it doesn't guarantee that you will get it. But not opting in indicates that you'd rather wait for wide rollout of LTS versions.
Just looking at the same math claim logic, not turning it on simply guarantees that you'll get it after everybody who has it turned on. So while turning it on doesn't mean you're first, not turning it on would always mean you have to wait until after everybody who did turn it on.
It's not a guarantee, but it can't hurt.