Rustaceans at the border

> very few devices even today need more than 64GiB RAM

Eh, it depends what you use it for. If you have a bunch of dedicated machines running something like memcached, you probably do want to shove an unusually large amount of RAM into them. The same goes for NAS systems or anything else that has a lot of RAM pressure. I'm not sure if you'd actually hit 64 GiB per device - that probably depends on other factors like the size and shape of your traffic, the number and speed of CPU cores, etc., but OTOH there are RAM-heavy systems that are difficult to horizontally scale (e.g. traditional RDBMS's), so I could imagine scenarios where you might end up deploying such a thing, at least as a stopgap until you figure out how to do replication without having glaring consistency problems all over the place.