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> SSD speeds will probably continue increasing, so removing RAM will take us about 20 years back to the past

I think you significantly overestimate how much they can reduce latency for SSDs. Keep in mind, even a 80286 from 1982 had a memory latency in the 200ns range[1].

[1]: https://cacm.acm.org/magazines/2004/10/6401-latency-lags-ban... (view PDF, table 1)

Getting rid of DRAM would take us back a lot farther than 20 years. A typical desktop PC circa 2000 using PC133 RAM would have had a memory access latency in the tens of nanoseconds.

> Imagine Windows 2000 never complaining about being out of memory.

Just put a huge swap file on it.

Or use zram or zswap

https://wiki.archlinux.org/title/Improving_performance#zram_...