Without bias from the article yet, I'll say that it's bad based on the fact that the land owners, Metro Vancouver, not City of Vancouver, do yearly maintenance on the Grind before things get really busy with the Grind users. It's this annual maintenance that makes the Grind such a usable trail for thousands and thousands of people every year. The kind of maintenance they do involves, but isn't limited to: helicopters slinging in lumber loads and other heavy equipment, moving large rocks, moving dirt, cutting down hazard trees, etc.
These activites just aren't a good mix with the public who in large part, by the time they're half way up or wherever the maintenance is being done, don't take turning around lightly. So they end up going off trail to avoid the workers, causing ground disturbance off trail among other situations or going right through stunned workers who can't do much because they're focused on their task.
It really bugs me how some people (in general Mazegirl, not directed at you!) feel so entitled to carry out their habit, ritual, whatever we want to call it, in conflict with workers who want to be able to do their job in as safe a way as possible. In this case, their job and how well they do it is directly linked with the safety of the recreating public, whether we're talking about the ones that are using it when it's still closed and being worked on or the ones that will enjoy it after it's had it's yearly maintenence and opened. Sure it's been a lot drier this winter but there's still going to be work needing done.
I'll go read the article now.