If the thing you’re selling costs $100,000, a separate parts stream makes sense, because the skilled labor that goes into replacing parts in a used device is worth the cost, compared to throwing it all away and starting with the new thing.

If the thing costs $100 and skilled worker time is at $50/hour, there’s just not much room for repairs to be cost effective, and repairs then become more of a reflection of one’s internal values around reducing waste or tinkering for fun than an economically feasible activity.