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Never understood the concept of measuring map size in km. It's like measuring distance on a map while ignoring scaling. Something like source's hammer units make a lot more sense to me.

In Source the scale is fixed (1 "unit" ~= 1 inch) and I imagine the same's true for UE.

1 unit = 1cm in UE, so 20km has some value as a measurement in game.

Of course, what matters more is what you do in that 20km, but it's also a limit coupled tightly with distant mesh performance and float accuracy issues.

It would accommodate MMORPG - that is couple of times the area of WOW during it peak years.

Also, keep in mind that's likely 20km x 20km x 20km.

Isn't that the use case for Level Streaming?

sure it would. you don't have to load it all at once