Not OK to use tranny bolt for ground?

[Phil S.]

I been visiting 18watt.com and someone there has made the case that one
should NOT use a tranny bolt for a ground. He says,: "...the other reason
for not using the transformer bolts is that they a point of stress on the
chassis. Even using locking washers, they can work loose causing a loss of
ground. This is why UL frowns on using them as ground points. The ground
point should be free of physical stress. If you loose a good ground
connection in the chassis the player becomes the next convenient place for
the current to flow."

I've seen a number of folks here recommend using a tranny bolt and have done
so on a number of occasions. Wondering if those more familiar with this
sort of thing have a comment.