I was a die-hard Apple iPad fan for over a decade. But I've grown frustrated and have mostly discarded it — I'm not the only one.

• Former Apple exec Michael Gartenberg has an iPad Pro and has owned various iPads over the past decade. 
• His iPad used to be his constant travel companion, more used than his laptop — but not anymore.
• He says the iPad is at an intersection between failure and ongoing success, and Apple must pay attention.

In 2011, when the iPad had been on the market about a year, it was declared an instant — and somewhat shocking — success, with about 15 million units sold and $10 billion in revenue in its first nine months. And Apple took a victory lap over the many, many media reviewers who had predicted it would fail.