This is part of what makes bluegrass so popular. Lots of people don't like synthetic anything, and bluegrass is the one genre that has steadfastly resisted technology's influence.
Bluegrass is real, and because bluegrass musicians don't depend on technology to fix anything, they tend to be very very very good!
In a post apocalyptic world, whatever musicians are left will probably be playing bluegrass
(there's a song there somewhere

)