These places are ventured into regularly by the devoted listener of Corelli, Locatelli, Buxtehude, and so on. Those bands all still have some degree of fun to them, and fun is not brutal. Turn back the clock a century or so and the concept of fun would be almost unheard of, at least in its current form.
What the HELL are you trying to say?
These places? Spotify? ANUS? Where on the internet would a "devoted listener of Corelli, Locatelli, Buxtehude, and so on" "venture" to? Are you talking about a state of mind that the listener goes to while listening?
Those bands? Blasphemy, Absurd and Mütiilation? Havohej, Graveland? Morbid Angel, Necrophobic or Hypocrisy? Who are you referring to? Apparently, they "all have some degree of fun in them," but I'm pretty sure there's nothing manifestly more fun about any particular selection of those bands compared to the rest, so that doesn't clear anything up.
After that you go on to say that "fun" is not brutal (a strange statement). After that, "fun would be almost unheard of" a "century or so" ago (a dubious statement). So, are you trying to say that the epoch of those composers you mentioned was brutal? According to that, a "devoted listener" of Baroque would also be... a metalhead? Or, is metal in some way not truly brutal?
There are some pretty strange posts here, but Jesus. No wonder people often don't take this forum seriously.