The mobile view was released the middle of last year and then updated since then so I don't think Jellybean is the best version to run it. As for it crashing your iPhone 6 a report about that and the other issues you have listed has been sent to the mobile view team.
In the meantime, are you able to exit the mobile view?
I cant exit using my smartphone's ("use desktop view") Effectively.
This causes it to often crash, or need to reload multiple times in new tabs until it gets right.
However later on I discovered an option within the UI of interface to exit mobile view. That worked fine, and now loads straight into normal webpage.
The normal webpage although not completely ergonomically efficient, or scaled for optimal use (especially on replies, and clicking unsubscripe thread accidently, etc., works perfectly fine. No crashes, no problems.) It is consistent and very usable on smartphone. Use safari.
I am not exactly sure how to get back to enhanced mobile view.. It has a pop up to go back sometimes. But after saying no a couple of times, it no longer comes back.
To be honest I dont like that pop-up, because I want to use desktop view.
However if there is an update, not quite sure how to get back to it, to give it another try.
Again the mobile view UI is better for smartphone. It is just too unstable for me to use right now.
I dont know if they overshot with it. Its almost too good from a UI perspective. If you look at Evernote forum's mobile view, its not as loaded with features. Its simpler. But it does not crash.