The fundamental questions are these:
Why is MS releasing Android and iOS apps on a different schedule than WP?
Why is WP often trailing?
What does this say about MS' commitment to WP and its future?
Particularly that last question makes this an emotional topic, because without MS' full support, WP won't be going any farther, pretty much guaranteeing it a place in the hall of irrelevant technologies. I'm just not convinced we really know the answers to any of those questions.
For example, it's fine to prioritize Android and iOS as a means to protect and promote Office, OneDrive, and MS' other franchises. That is also vital to WP's survival. If MS can't postpone those efforts and requires them to achieve a dominant position on all mobile platforms now, just to ensure they remain relevant, then we should pretty much all be in agreement that is a good move. However, if MS has since decided that WP is unlikely to ever provide them with a competitive advantage, and that from now on they will compete primarily via their services rather than their mobile platforms, then that is an entirely different situation in which WP loses all strategic relevance. One situation I'd be fine with, the other would make me want to start looking elsewhere. Finally, I'm not even convinced MS is deliberately prioritizing anything over WP. I think it's very well possible that Office for WP is on a different schedule only because MS wants to develop a single version of touch-office for both tablets and phones, which would necessitate that W10 mobile has sufficiently progressed towards completion. If W10 mobile wasn't ready, then why not allow the Office division to work on the iOS and Android versions in the meantime? Coincidentally, W10 mobile probably would be reaching the point where one could start developing for it right about now, so iOS/Android versions releasing now would make sense in that way too. Such an approach would eventually provide us with the best version of mobile Office bare none. It just wouldn't provide that right now. How comprehensive Office on WP ends up being, will be very telling.
The point of all this: just the fact that Office for WP is on a different schedule means nothing. The real question is why! I'm not sure if we can really be so sure about why... maybe MS has decided iOS and Android are more important. Maybe it's just technical realities related to W10 mobile. Maybe it's something else entirely...