At worst the knot will get a bit loose from time to time (like maybe once a year), and then it takes a few seconds to tighten it again.
I expect my shoes will fall apart (they're already pretty old) before this knot unties.
[1] - https://web.archive.org/web/20051203081429/http://web.ukonli...
loafers sole isn't usually strong enough for outdoor use. old sneakers with the rear part bent in and laces tightened enough to slip in with ease while not falling out are great for quick trips like to take out the trash or walk the dog, so you don't wear and tear your good shoes.