It seems lazy to me.
With any kind of wood, there is a stain and a finish that will bring out the natural beauty in wood. It just takes a lot of time and hand rubbing. A fella could have the grips checkered. Wow. Or his frame engraved. Double wow. Even hand stippling looks nice and shows someone put in effort. At least I think stippling looks okay.
I even like skateboard tape. It makes a statement.. “I use this tool hard, it’s not here to be pretty.”
I’m not sure what statement flaming makes. But it’s your gun and you do what YOU like!