I'll have to plead guilty to both part A & part B.
Yes, I have one knife in my pocket every day.
And yes I rotate. Well not me, my EDC choice rotates.
#1 is my Opinel No.6 carbon due to lightweight and overall usefulness.
#2 is SAK Cadet when duties as assigned might require more than a blade.
#3 is Case 63032cv just because I like having it around.
#4 is Queen 9105 Jack, certain things I only use this one for.
(no, not earwax removal)
#5 Schrade USA Switchit, lighweight good back pocket one hander usually
tote when outside doing yardwork.
#6 6347 redbone pre70 holidays carry.
In some small way I hope this helps in your research project.