I didn't bother replying because:
-the topic sentence is incredibly broad
- in the OP you jettisoned the topic sentence with some weird notion that an entire subgenre is underrated
- you linked to six videos but didn't bother to explain any of them
Then there's the music itself. Mascaron sound more deathcore than anything what with the chug-chugging nonsense, solitude aeturnus have godawful vocals & the instrumentation is boring to boot, scars of life play second rate nu metal like it's 99.
Isole are ok. If it wasn't for them, I'd **** on this thread.
Here are some groups I think deserve more credit:
ancestors play noisy, lo-fi black metal in the vein of Ildjarn.
Impiety play black/death metal, while every release is different they always work with these genres motifs. This is one song, nearly 40 minutes in length, which represents one of the most interesting attempts at incorporating progressive elements into an explicitly extreme framework without overt genre blending such as Opeth make us of.