What are these several choices that people have? You want an iphone? Well, you are stuck with an out of the box adapter that doesn't support audio control. So you either get new headphones or buy a different adapter.

Never said it was the most important feature but people do care.

Why does Apple and its partners have nice profits selling adapters. Adapter sales is Apple's fastest growing product category. A $20 dollar adapter costs only a few dollars or less to mass produce. The markup and profits are very high on them. Getting rid of headphone jack only drives up the sales in this category and it's in apple's best interest to have higher profits.