True, bland, but it takes a while to write a decent app.
My guess is that Blockchain and Coinbase got sick of Apple, like I did. Why should I bother spending the hours working on my app to resubmit to Apple, knowing the headache I'm going to have to endure to get past their red tape? It's a royal pain!!
The easy answer is because you can make a ton of money off it. ;0
Coinbase will reintroduce their iOS app and it will probably be the go-to app for most of us. It's just going to take some time for it to look legit.