if you think such animal husbandry is "wrong" from some moral judgment,
then is it also "wrong" to confine fish to a few square cubic of water?
obviously we have a forum full of people who don't think that's wrong.
so the "wrong'ness" issue of clipping a few millimeters of crayfish thumb;
is being effective or not - I'm here to tell you it's VERY effective,
as it does zero harm to the crayfish, it's ability to thrive, and
increases it's potential to coexist peacefully with smaller tank mates.
just think of all the crayfish that get disposed of by their owners
because they didn't coexist in their community tanks. had this
clipping practice been maturely advocated, they'd be alive today.