YOU DON'T NEED TASK ANALYSIS... YOU NEED THE RESULTS IT PROVIDES.
Clayton Christensen, the reknowned Harvard Business professor, who wrote The Innovator's Dilemma, quoted another Harvard legend, Theodore Levitt, as saying:
“People don't want to buy a quarter-inch drill, they want a quarter-inch hole."
In other words, the need here is the "quarter-inch hole." There are many tools that might make a hole for you. A laser beam, a nail, an awl, or my personal favorite - a firecraker - all can makes holes of various sizes. If task analysis is a tool, then what is it we need?