[colonwqbang]

Being able to implement a solution after having already been shown how to do it is sufficient for many roles. But not all. Some roles require that you are also able to figure out solutions to problems you have never seen before.

If your company requires only the former that's fine. But if you also require the latter, that's fine too and it's ok to test for it in your interviews.

If a company generally requires candidates to be overqualified for their intended role, that's a bit dumb. But I imagine that such a problem would eventually be fixed by the free market (supply of workers at various qualification levels vs. demand for said qualifications).