sorceress, DIMMs weren’t often installed in pairs, at least not before DDR RAM, which we shouldn’t cover, it’s not a DOS topic.
30-pin SIMMs were always installed in pairs or even quadruples. They are 8-bit wide but CPUs had 16 or even 32 bit wide data busses).
Personally, I think, all those memory tech advances are pretty cool. I just hope we don’t lose the audience with those details.