I suspect there's a lot of people on the 2028 refresh train. If you bought a 1700 in 2017/2018 - which a lot of people did, because it was so good $/perf, you could ride the AM4 platform to a 5900(x/xt) now and be still pretty happy, but AM4 is a dead end now and the X570 motherboards are hard to find. So, if you want more PCIe, DDR5, etc. it'll be time to jump once it starts to feel sluggish for high end tasks (gaming, etc.) around that time.