1. scarlxrd and ghostmane arent trap artists. Cause the meaning of the word trap has warped. Trap used to stand for technological rap what stood for rap with a heavy emphasis on the beat of the song. But the genre had a spike in popularity and now trap is a genre on its own and nothing that it used to be. So these artists arent trap artists cause the meaning of the word has changed over the years.
2. metal and rock probaly wont go out of style anytime soon. As rock was at the center of the industrilization of the music industry and there will never be such a big following for the artists that where then up and coming (Beatles, stones, the kinks (kinda), elvis presley, etc).
3. the genre you are referring to is more referred to as trash rap.
if you like that kind of stuff than you would like probaly like XXXtentacions older stuff:
King of the dead,
Run op on me,
I spoke to the devil in miami and he said everything would be alright,
Look at me,
Take a step back,
freddy vs jason,
Alot of the songs feature ski mask the slump god to. One of my personal favorites of this kind of style is:https://www.youtube.com/watch?v=wTEpl27IgMw
and my personal favorite:https://www.youtube.com/watch?v=EIX-TzFHwWg
XXXtentacion and ski mask made this style really popular.
And if you want more of these kind of rappers who put a heavy emphasis on beats you should listen to anything that is produced by ronnyJ.
A few other songs in this genre are:
GHOSTMANE - MERCURY
GHOSTMANE - 1000 rounds
Suicide boys - south side suicide
suicide boys - Dead batteries
Denzel curry - Black metal terrorists
Denzel curry - Ultimate
Denzel curry - Vengeance
I would post the links but this is just so damn much to post.
PS: I started listening to this kind of genre begin 2016.