I am not sure if I understand your first sentence. Regarding the second, no, they encourage wearing out shoes quickly and repurchasing often or purchasing many pairs. Two pairs purchased to alternate is something done to maximize longevity, so in the long run it is cheaper than buying one pair and wearing it daily. It is in a shoe repair shop’s interest, though, and that’s where I first heard the tip.
I misunderstood the original comment. The person was posting a strategy to keep shoes from wearing out too quickly. So you're right, my comment does not make sense, sorry.
Yes, shoe companies generally want people to wear out their shoes quickly to sell more shoes, and they also change up the models offered so that when a serious runner sees their shoe is no longer going to be offered, they buy up as many as possible.
I understand what you’re saying about changing lines/models now and I do agree this happens. I experienced this recently when attempting to replace some 2017 Merells. Even Walmart does it with their cheap yard shoes, I suspect.
