Except that a hybrid rocket engine burning something like e.g. PMMA is also easy to throttle, and doesn't blow up like a mixed mist cloud of keosene/LOX. Also,

Except that a hybrid rocket engine burning something like e.g. PMMA is also easy to throttle, and doesn't blow up like a mixed mist cloud of keosene/LOX. Also, fire != explosion. The former is only hot, the latter has a tendency to throw shrapnel.