Is Poppy really that unchallenged in a teamfight?

Have you never faced a good Poppy? I doubt it, otherwise you'd recognize how hilarious your post is.

A good Poppy can*** literally*** walk into an enemy team, destroy a carry, and walk out.

If she is the only one in your team, who can hit her except the one whom she ult, normally the champion who has no cc or exhaust. If she just connects with a immobile adc, a simple E>AA>Q>AA kills them

Here is why her passive and ultimate are broken. She either A, ultis that tank/bruiser focusing the opponent ADC, putting her stupidly far away from the only one that can touch her and kills the opponent ADC, you can't damage her, you can't CC her, you can't stop her period and with a full AD build, she is going to kill that squishy ADC, or she B. ultis the ADC and two shots them because of the damage amplifier.

if she ults and runs at your adc sure, he/she can run away but then poppy has succcessfully zoned the adc away from the fight thats a pretty big deal and any smart player with a gap closer would know to not yolo charge alone into the enemy team well poppy is invincible anyway but having good follow up with that engage will completely rek team fights

Have you ever tried to RUN from a Poppy?