Early iOS had wonky reset issues too.
Instead, they're just offering us their own versions of things just because they can, not because their's is any better. Maps being exhibit A, and Apple's mail client not changing in 10 years (aside from some minor adds and removes) are examples of this.
Apple used to mean software for people who were not technology savvy. Now it means phone software for people who are not technologically savvy, and computer software that's just like everyone else's. Frankly, I can never figure things out on an iPhone. They're too confusing in their interface. Especially compared to my beloved Newton 2000.
How is Mail.app supposed to change though? It still completes the task that it was designed for. I'll agree that Mail's stability has been spotty across releases, but how are you expecting them to change such a core app?
I remember that in (I think 10.3) they "fixed" the issue by having a timeout dialog popup and ask if you wanted to disconnect... only it was too sensitive and would popup (and then go away before you could react) if there was any jitter in the network connection.