Why do you need to put faith in them? Switching email providers is just a DNS change away, and email messages can be stored locally - actually it's encouraged to do so.

You do have a point. But I still do not feel comfortable. Besides I can't envisage changing providers whenever I face trouble and it gets unresolved in a timely manner which is what I assume in the current setup. Pinboard is another example. Anyway, it kind of doesn't work for me.