That's not just an L-mount issue though. Sony is starting to do the same thing, where if you're not using Sony lenses you miss out on things like focus breathing correction. A big selling point for Sony was how open the mount was, which resulted in tons of third party lenses when Sony themselves didn't have much of their own lens selection. We're now seeing them becoming a bit more closed off with features that only work with their lenses. And Canon is trying to cut out every other third party completely. Granted, they aren't in any "alliances" but the end results are the same: if you're not using their lenses you're taking a hit with capabilities/performance.
The thing about the L-mount alliance is that things can literally turn around in a moment for them. IF Panasonic finally go the PDAF route, I think you'll start seeing a ton of third party lenses for the mount, like you've seen for Sony and Fuji. Ideally the alliance would have more cooperation, and I hope there is more of it moving forward, but even if there isn't it's not really any different from what every other camera manufacturer is already doing.