Why no piezo electronic switches in flashlights

I have a question for the technical forum members. I hope this is the right place to start this thread.. ?

When I look at some high end reliable cave lights and dive lights, often piezo electronic switches are used. They seem to be very reliable because there are no mechanical parts in it. Also they are highly waterproof by default. I'm curious why we don't see this kind of switches in normal flaslights or headlights? Are they more expensive or are there other reasons? I hope some of you could answer my question... thanks!

I guess because piezo switch costs about 30-50 USD and is big. I never seen one smaller than 16mm diameter and is pretty tall as well.

Ok, thanks for the answer! Indeed costs and also size is an important factor. I didn't realize that those switches are so big.