Comment by wongarsu

Computing hardware has always been on 3-5 year depreciation schedules. Not because it doesn't last, most of it will last decades, but because the next generation is so much better that your total costs for the next three years are lower if you buy new gear and throw the old stuff away.

And that's not just because of the rapid advances, but also because servers are expensive to run relative to their purchase price, and setup costs are cheap. For machining tools setup costs can be substantial, and the cost of keeping an old machine around is small