The oneplus company is small. Updates will come slowly.
With that said, I have not owned a phone where updates came frequently or even soon, besides a nexus device. All Samsung, HTC, LG, etc... have slow update releases, especially when each carrier has different requirements. One carrier usually gets the job done before the others and so on. With one plus, at least it is released at the same time, regardless of carrier.
If you judge a device by the official updates, then the only choice for you would seem to be a nexus device. I can't speak for every one here, but a lot of us buy the OP3 so we can use buggy releases, customize, and tinker with the device.
As far as dev support for the OP2, I can't answer that. But I can say I bought the OPO when released, and the OP2 just wasn't a big enough of an upgrade for me to switch. This could have been the reason dev support was low also. This device however seems to pack enough guts internally to justify the jump, and the price tag is super appealing.
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