@neologist,
That's too much noise, and effort.
When someone turns on a blender, food processor or coffee grinder, even for a couple of seconds, I want to get out of that area ASAP.
In addition, I really like my foods as simple as possible. Why grind it up when you can eat it whole? I always take an apple over apple sauce anyday, and have no idea why people insist on taking a perfect banana and doing anything to it.
Of course many foods have to be processed to one extent or another, i.e. bread, yogurt, pasta, but I'm not the one buzzing and whirring the grain.
Yogurt ferments pretty quietly though, I'll give it that.