5e has a rather generic way of assigning mediaeval/fantasy skills to a PC; and then a lot of very detailed rules for assigning primarily combat abilities to PCs that are mediaeval/fantasy abilities.
And has a fairly tight combat resolution system, provided that the combat is a melee or skirmish lasting up to a minute or so.
I think it's pretty opinionated! I mean, just as one example, change your combat from fantasy melee to (say) galleys with catapults and rams, and the ranges and durations for combat spells will stop working smoothly. (Eg Command - Approach is obviously designed in the context of close-quarters melee combat. In ship-to-ship combat, or even chariot-to-chariot combat, the 60 feet range and the 1 round duration won't work very well.)
But anyway, I don't mean to derail your thread too far. So unless you're interested in keeping this going, I'll do my best to let it drop!