Why are most mid lane champs, handheld?

Ive been trying to get better at mid. EVEN WHEN I WIN MID Any actual mid lane champ Whether they get stomped or not get 1 item an delete anyone. It triggers me how a 50 cs behind fizz or zed, are doing so trash buy 1 item and play like nothing happened.Same with Leblanc like what's the point of wining lane.
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