Oh yeah, I think learned about the 'Ian knot' on hn as well, though I use the secure variant: https://www.fieggen.com/shoelace/secureknot.htm
I tried it just now, and it's indeed very secure.
I almost always wear sneakers, and don't have any problem with laces getting untied, so I'll stick with the Ian Knot.
I will suggest this secure knot to my son, though.