You're the prime target in teamfights if you're a threat. The mid laner could be the prime target if they're doing better than you.
Sieging is the job of any champ that's built around sieging? Jayce/Xerath/Ezreal/Ziggs etc.
Knowing when to trade honestly, reading that made me think you're on the stupid side sense you don't realize that goes for EVERY role
Good positioning really? Reallly...you're pretty stupid if you dont think EVERY role has to have that including support. If i'm playing Raka I can't be in the front line tanking up everything. I need to be in the mid/back healing everyone
Also it's not only the supports job to ward. If you aren't helping keep tri/drag warded you're a terrible adc