Sure, you can print minis with an FFF machine. But there’s a reason the mini printing folks primarily use SLA. For that particular application, it’s significantly better. I say this as someone who uses an Ender 3 and is quite happy with it. If my main goal was printing minis, I would probably want an SLA machine instead.
FreeCAD definitely has a steeper learning curve and a few rough edges, but to me it was absolutely worth it to learn. I really don’t like my files subject to the whims of Autodesk.