Demon's souls for me is a wrpg made in Japan in a way that it is a western centric western inspired (in terms of both setting and gameplay elements) title. Jrpg on the other hand are games that have elements of anime/manga/ over the top characters and are just bright colourful with little tribute to realism (as in being believable).
So for me (and I'm assuming the vast majority of rpg fans) the prefixes describe more of the composition of a game rather than where it is made.
I love souls series but I can't stand modern jrpgs. Obnoxious voice acting, childish sometimes very generic and cliche dialogues, plots and characters that makes power rangers oscar worthy in comparison.
I know some western blockbusters like call of duties etc have very cliche, repetitive and sometimes predictable plots etc but you can't dispute the fact that western devs put a lot of effort into writing and narratives to their games.
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