I would strongly agree with this critique, the characterization of goodness as memetics is severely under theorized, memeticity is a superficial aspect and there is a deeper structure worth considering.

For trivial problems, remembering you have them and that they are solvable is most of the magic here. My friend got me doing this on simple fix problems specifically and within a few weeks I had fixed a variety of super annoying things that had bothered me for years and each required about $2 to fix. A broken drain catch, no good bottle to water my plants, not having hair ties, missing a gasket. Problem solving has escalated from there.

And, at risk of quashing OP's admirable spirit, a more "robust" toothbrush would exacerbate the relevant harms