not all hill-style longbows (actually, american flat longbows) are alike, nor will all jar yer arm and teeth.
so what are the advantages, if any?
welp, they do look kinda cool.
aside from that, they do offer a large measure of "stability" in the shot, since the limbs are narrower and deeper than typical r/d style or plains flatbows. i think there will always be a fascination with these type of simplistic looking longbows, and that's about it.
what are the drawbacks, if any?
to be factual, more than a few. imo, they can be a challenge of sorts. not all are made alike and some will downright hurt ya. no matter what the limb-set (back, straight or follow), they need to be lots longer than an r/d longbow or recurve, for any given draw length. lots longer. they aren't speed demons, but they typically love very heavy arrows. it takes time to get used to a 68" bow where before you got by just fine with 62" or even 58". the approach to shooting an american flat longbow, in terms of form, will require adaptation and perhaps a slight change in form - you work with the bow, it typically won't work with you.
imho, what sez "traditional bowhunting" better than a good american longbow and a back quiver loaded with twin blade woodies? however, adapting that idyllic image to reality, therein lies the further challenge of traditional bowhunting with a "hill style" longbow. nope, not for everyone - but still cool to admire! :cool: