Cause im not speaking for lesbian couples... But illuminate me, what makes a strap-on that much different in purpose in sex vs a dick... Cause seriously i cant think of one
Your original post was about why strap-on is considered yuri but futanari is not. Yuri is between two women, a futanari is neither a woman or a man.
But in any case a strap-on is not a "representation" of a dick, it's a sex toy. Some dildos do look like actual penises but I can honestly say I don't know a single lesbian that uses one of those.