Kinematics
Hero
OK, this is a trivial-level question, but: Is there a reason that the Belt of Hill Giant Strength grants 20 Str instead of 21? All the other giant strength belts give odd values corresponding to their equivalents from O5E (23/25/27/29).
It makes no difference for the strength bonus granted (+5), but it does have a minor effect when applied to the barbarian's Indomitable Strength and the berserker's Reliable Might, both of which allow you to use your strength score for any check that rolls less than that score. (I'm not sure if there are other features which also use that mechanic.)
The potions of giant strength have the same quirk. The hill giant potion gives 20 Str, while the rest (other than frost giant, which gives 22; note that the frost giant belt gives 23 strength) give the usual odd scores.
It makes no difference for the strength bonus granted (+5), but it does have a minor effect when applied to the barbarian's Indomitable Strength and the berserker's Reliable Might, both of which allow you to use your strength score for any check that rolls less than that score. (I'm not sure if there are other features which also use that mechanic.)
The potions of giant strength have the same quirk. The hill giant potion gives 20 Str, while the rest (other than frost giant, which gives 22; note that the frost giant belt gives 23 strength) give the usual odd scores.