My Pommy mate in Australia was most adamant about not using a metal lathe for woodturning. Never saw the problem, but same mate, who worked for Vickers during WW2 also flatly refused to use carbide inserts. But there are lots of occasions when the metal lathe is preferable, like when making round rods that need to be of even diameter. Also, if you need a specific taper, they are preferable. Had a job making 350 tapered plugs for an architectural feature on an old house. Plugs were 45 mm long, 9 mm in one end 27 in the other. Quite a job, and the plugs came out at nearly £2 each. But the metal lathe, a Chester Crusader, was just the one for the job. One tip: Use RCGT inserts for woodturning on metal lathe.