[alexashka]

Because, it, doesn't, solve, their, problem.

If it did, they would do it, and we wouldn't be talking about it.

This also applies to all other possible 'why don't X do Y?' questions - it's nice like that.

[themadturk]

They could do it if it was presented to them as a norm, "this is the way we like to do messaging around here." Not everyone spontaneously comes up with the best, most effective way to do things. Sometimes they need to be taught.