IMO, usually in a verbal interaction there are two kinds of people; those who seek consensus and those who maintain their point regardless of the views and comments of other parties. Thus, for me the distinction between a conversation and a debate.
In the conversation on adding triggers: I agree include eyes although I am often too lazy to do it. For the last few years I almost always add gills.
Two items not mentioned yet because the question was on streamers, but which have helped on other flies, are egg sacks to distinguish female mayflies and caddis, and a small clear glass bead representing an air bubble on diving caddis/boatmen, or emerging caddis and mayflies. I believe wraps of silver tinsel formerly did this job, but I think the bead is better.
I have some flies by Fran Betters (later years) which were all tied with hot red thread regardless of the pattern, so I would say he thought that was a trigger.
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