The problem with saying that orthotics are just a crutch how do you overcome overpronation?
Are you saying that you can unflatten arches? Some people naturally have flat feet and in that case over pronation causes the shockwaves when running to travel up the shin rather than at an angle away from it, and tires all the lower leg muscles in having to over compensate for this.
I suffer badly from shin splints and am specifically focusing on my tibialis posterior and strengthenging all my lower leg and foot muscles/tendons etc…but I do also have orthotics which I need to wear aswell.
I do think that for some people an orthotic is needed due to the way in which their body naturally is.
It depends on whether your problems are down to a weakness in the lower leg muscles which can be sorted, or whether it is down to being flat footed/ dropped arches or over pronated naturally.