There is a middle ground between the two extremes.
I would be fine with better signage being put in at the Muir Trail / Whitney Trail junction (that is a real problem spot). The junction with the walk-off traverse is less problematic. It is pretty obvious where the trail is. The walk-off does not look like a trail, and isn't even noticeable to most people. But even here, a sign could be added. Just a sign with an arrow pointing left that says "Trail" would suffice.
I would not see the sign making a difference in this latest incident though.
