I still like flattops too. My
Altamira Gypsy Jazz guitar is an interesting hybrid. Much better volume and tone than most any flattop I've played. Every so often I bring it to our bluegrass jam and show the Martin pickers what a banjo killer sounds like.
It's funny how we get bound by tradition. Someone decided that Martin was the standard for bluegrass, but they just can't hang with a fiddle, mandolin, banjo or dobro. Everyone has to back WAY off when the Martin picker takes a break.