Hmm, your reply went in a direction I very much didn't expect, though I can see where you're coming from if I squint. What I called technically interesting is

Hmm, your reply went in a direction I very much didn't expect, though I can see where you're coming from if I squint. What I called technically interesting is "working on a large scale product", which for you seems to have implied "work on a new problem", but for me it's exactly the opposite. The kinds of large scale projects I find the most technically interesting are long into their growth curve.