Ah I see now where you got the idea.
The prime reason for going 64bit in those cases is that they have a lot (and I do mean a LOT) of high resolution textures animated figures, castles, hills, trees, etc.
2K, 4K and especially 8K resolution textures eat up memory like nobody’s business.
In EVE we do not have to worry about hills and trees, animation is khm… reserved… and ship skins are in 1K resolution. So it is really light on a basic level.
With massive fleet fights it is a different issue, but I don’t think enabling more memory on the client side would help in in any significant way.