I was actually surprised at how medium and small creatures are almost identical. Beside the variant rule on encumbrance, the only thing I noticed was disadvantage with heavy weapons. Certainly FAR less harsh than 3.x. Am I missing anything else? Is there a blanket rule on reduced speed (might have missed it) or is it just that each small race happens to have reduced speed?
I can think of an advantage for prone small guys.
A 30 speed PC uses 15 move to stand up.
A 25 speed PC uses 10 move (12.5 round down) to stand up.
A 20 speed low Str heavy armor PC uses 10 move to stand up (which is amusing that the high Str PC needs to use up more move to stand up than the low Str PC).
A 15 speed low Str heavy armor PC uses 5 move (7.5 round down) to stand up.
In both cases, the small PC uses less move to stand.

Course, those high speed Monk Half Elf PCs with magic that boosts their speed use more move to stand up too.
