2: I have many headphones with higher quality sound than earbuds can provide.
3: Bluetooth still kinda sucks, even after all this time.
4: Bluetooth is subject to denial of service, security concerns.
5: Apple's purpose with the decision was to increase revenue, that is all. You all are now paying $$$ for headphones with batteries, etc. onboard, and they no longer had to implement an audio amp or jack. win for apple, not the consumer.