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But is this what a good reset signal looks like? I expected it to be driven sharply between 0 and 1 logical states.

I found the PST518 datasheet here:
https://www.alldatasheet.com/datasheet-pdf/view/87726/MITSUMI/PST518B.html

My understanding is that the PST518 output is meant to be fed into a Schmitt-trigger to get the sharp power up reset signal that I'm looking for.

But on the A3000 PCB, /FAIL rruns to Gary's and Ramsey's POWERUP pins.

Perhaps they have an internal comparator for this purpose.