1. It's irrational transferrence - an obsession about features and bling that is not actually necessary. But note, I did not say it's a problem, I just said it's a thing.
2. "Best way" as you present it is very subjective, as the next guy comments -- he'd already bought two conicals, so of course with that investment a glycol chiller is a reasonable next step.
3. Ease of use, I doubt.
4. Lots of solutions are required by lots of problems.
5. Don't have to move or clean? Really? A fermenter is for fermenting and then you package. 75% of brewing is cleaning anyway, so are you advocating serving from a glycol-chilled conical? How do you brew the next batch, buy another conical?
6. You can carb in a keg, naturally or with tank gas.
7. Pressure transferring is quite good if you're moving still beer.
8. No, racking still-fermenting beer in a closed loop is the best solution for limiting oxygen exposure.
9. They serve a purpose one has created by over-complicating things. See point 1.
You don't have to justify your purchases to me. I am just saying they are technically not necessary for ease of use, limiting oxygen exposure, pressure transfers, or brewing large batches.