The native AOSP email app, for example, doesn't even allow you to choose which email address to send from when replying (that, or it's so hidden that I was unable to find it.) Unfortunately, like most AOSP apps, it's been effectively deprecated in favor of the Google alternative (Gmail) so it's unlikely to get any better anytime soon.
I'm also so glad to see that they are releasing on both platforms simultaneously. Having used both an iPhone and an Android, I find it very frustrating when a product is released on one but not the other[0]
[0] Yes, I understand why startups choose to do this. We had to decide which platform to support first at my startup, so I understand the tradeoff involved. But as a user, it's still frustrating.