Challenge 2: Losing Easy Corner-Radius Control After Converting to a Path — Solution Walkthrough

The answer:

Per this chapter's own warning box, converting a shape to a fully
editable path trades away its "live" properties. A rounded rectangle's
live corner-radius handle and numeric width/height fields only exist
while the shape remains in its original rectangle form. Once
converted, it becomes a plain set of anchor points like any Pen-tool
path, with no memory of having started life as a rectangle with an
adjustable radius.

Why the colleague lost easy control:

Converting immediately after drawing, before any further editing was
actually needed, gave up that live radius control for no real benefit
at the time. Adjusting the corner radius now requires manually
reshaping the anchor points at each corner — exactly the harder,
Pen-tool-style editing this chapter contrasts against the simpler live
handle.

What should have happened instead:

The rectangle should have stayed in its original, editable "live" form
until it actually needed to become irregular in a way the shape tool
itself couldn't accommodate. Converting to a path is a one-way trade
that should happen only once it's actually needed.

WHY THIS WORKS AS AN ANSWER
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This exercise checks that losing easy corner-radius control is
correctly traced back to premature conversion from a live shape to a
plain editable path, per this chapter's own warning box.