Sorry. Meant Screws not Bolts lol.
Need to Learn English xD
Not entirely right.
See the thing is. Laws of Physics usually dont just apply to a single case.
For Ages we know that when something impacts it causes tremors.
For Ages we know that these tremors cause a movement and thus can affect things which are kept together by cohesion and friction forces like screws etc.
Shoelaces work by the same Principle. You tighten them and the cohesion which keeps em together is the friction caused by moving away from each other.
Of course however if you keep applying force to this constantly. (What we are doing by walking) they will come lose at some point.
If you learned to be a Mechanic you also learn that there is certain limits to these forces.
Because smaller tremors will cause movement but wont be able to break the cohesion. Meaning the thing affected will move back and not get loosened over time.
While forces strong enough to shift the new position by just a micrometer will if often enough applied at some point cause them to go apart.
So we knew this to be the case beforehand.
Of course proving it to be True is still importand.
But I dont think it needs to be made such a big new Story.
Its not like we found out something new

We merely proved something we knew
Importand difference.
And its importand to know this difference.
Because otherwise even now you would not actually know if this goes for your Shoelaces.
After all they only tested it on a certain Shoelace
So unless you believe such Laws to also Apply to other cases you would still not know if your Shoelaces come loose as well