Actually I've used my Ryobi clone to cut an exhaust pipe off my Acura.
Used the glass reinforced disc however as those thin discs shatter.

Which are a helluva lot different than dremel cutting discs. A grinder with
a 1/4" disc has considerably more durability that the paper-thin ones used
in a dremel.

But yes, cutting off a screw instead of just backing it out is stupid.
There's plenty of sensible reasons to use a dremel, but since when has
advertsing ever been sensible?