True, but I find it hard to believe that not a single keyboard developer has managed to offer a completely smooth, relatively bug-free experience yet. Obviously I don't know enough about the process to say for sure, but if my Swype and SwiftKey keyboards are still crashing this late into iOS 8, I would assume that it's the operating system's less-than-optimal integration, and not the developers' fault.
I mean, I could be completely wrong, maybe all the 3rd party developers are doing a sloppy job with keyboards, or maybe I'm just having very bad luck. But I personally believe iOS currently has poor optimization for 3rd party keyboards.