As long as we are talking about personal hobbying (and not competition or commerce), it seems to me the only criteria should be whether something is
enjoyable and/or
rewarding. If someone finds cutting formers to be a tedious chore, I see nothing wrong with them using laser-cut parts, if that makes their hobby time more fun.
After all, the whole notion of "short-cuts" or "cheating" is a slippery one. As Jagolden01 pointed out, it's all a matter of drawing arbitrary lines. Someone who frowns on the use of laser-cut formers is vulnerable to the frowns of a scratch-builder who scorns all "pre-designed" models. The scratch-builder in turn could be looked down upon by a purist who mixes his own inks or produces her own paper.
It's a hobby, it's supposed to be fun.