"I'll choose what I work on" is there, the same as in past years. You will see it if you click on the "Wages & Income" tab or the "Deductions & Credits" tab. (The tabs are different in Home & Business.) I don't know why you're not seeing it.
"I'll choose what I work on" is part of the Step-by-Step interview. It's just a different way of going through the interview topics, instead of going through everything in sequence.
