This. One prime example I can think of is Gmail. I've used it pleasantly, while all the under-the-surface updates happened. I was pleasantly surprised when one

This. One prime example I can think of is Gmail. I've used it pleasantly, while all the under-the-surface updates happened. I was pleasantly surprised when one day, Gmali client to remind me that I'd forgotten to attach the file I've said I've attached. It's one of the subtle updates which simply enhances the experiences, like performance changes. Unfortunately the opposite example can be found in the same product, Gmail; when they visibly and ostensibly changed the UI, it was immediately noticed, and widely hated.