I do mostly low volume but put in metabolic work as i know it does have some merit in growth.
For instance, i'll do 2 heavy working sets on Hack Squat and at the end of the my leg work do 4 sets of leg press, short rest periods, 15-25 reps per set. Engorge the muscle with blood to fill it out.
I do think that mechanical tension through hard and heavy training IS the best way to go, but we also know pump shit works...(maybe just not as well)
I look at Fortitude Training as a prime example. Hard and heavy but with elements of metabolic work that feel good and just pump blood in a much as possible.
I wouldnt call it HIGH VOLUME but its the common elements of high volume approaches. Ever since i started training (15 for football) ive always training to failure.
So trying to do something hgher volume with less fatigue and failure is almost impossible to me.
I also think it depends on what you are training and safety wise. Using hammer strength pressng machines, i can push myself to true 1000% failure.
On legs, i know i do need a bit more volume because i would kill myself if i training to 100% failure on Hacks...i can drop a chest pressing machne and be A-OK...i cannot do that with leg press and hacks.