my experience is that a quality instrument can definitely help, but it's not the direct reason that your skills will improve. having a quality instrument definitely makes me want to practice more. if you spent that much money on it, you'd feel dumb not to put it to use. also i'd say it can help your technique to an extent because a quality instrument can, in cases, be more comfortable to play. this also helps build speed for the shredders. but that's still only going to be the case if you practice consistently.