I’m using it for Fatigue in my current project. Spells don’t cost Magic, they just drain casters heavily to use them. They’ll have to use a Wait command to restore Fatigue. Regular attacks and non-magics also drain Fatigue. And gear increases Encumbrance, further lowering Fatigue each turn. Fortunately, its easily recovered. Generally able to heal 45/100 from Wait, Food items heal around 65/100 and Fatigue Potions heal 100% while making cutting Encumbrance by 50, well beyond how much Encumbrance you can actually get.
Apparently MZ lets you preview move routes in the move route editor without having to start up test game. That could save a lot of time during development compared to MV, especially for a long game that uses a lot of event movement for cutscenes.