Are you listening to users, or just trusting the experts?
Over the years, I've organised, observed or managed numerous user testing sessions. It gives you a pretty good sense of what will work and what won't, so the temptation is to skip testing and just do an 'expert' review.
Why bother with user testing at all if you've got 'experts' to hand and its something that's been done many times before?
Fortunately, my local council helped answer that one. They received feedback that a nearby path was notoriously slippy in icy conditions. So, they dutifully sent along experts, who (as they'd no doubt done a 100 times before) assessed the steps and put some excellent rails on either side.
Unfortunately, as any actual user would tell you, the steps themselves are, by some quirk of atmospheric thermodynamics (if that's a thing), rarely icy. It's the path just below the steps which is lethal in winter...and needless to say, it still is.
If you can test, do. It's interesting, insightful and almost always pays for itself many times over.

