My point exactly. You never know on one of those "pedia" whether
the material was written by a 5 year old or by a guy with multiple
doctorates in the field.
I fear a "nihontopedia" would be swamped with kids who just got
a "genuine ninja sword" at the mall and/or by folks from the
SF Japanese Sword Socieity (aka the ninja nation). At least
with individual websites you know who is writing the material,
likely have some indication of their background, expertise, etc.,
or can ask around the Nihonto world about them.
Sure there are contradictions on the web and in books, but then
how many folks have had the same sword or tosogu attributed to
different schools/makers by submitting it to different Shinsa. Even
the Japanese experts sometimes contradict each other.
Rich S