Numbers may be numbers but you are missing the point. The act of perception changes the reality. If someone feels a ship is more agile, it will be, in their hands, more agile. Intuition and "feeling" are not nonsense responses to the world - often it is down to the "feeling" being context-dependent. For example, it may be that a ship feels slower - it may be the same, but if everything else is faster, then it is, effectively, slower.
Of course, this is a philosophical point and not in any way related to Discovery.
Plus, it depends on the manner in which ships are tested. I'm pretty sure my nippy little sea serpent is agile in the grand scheme of things. But against a very experienced player it will fly like a paper plane made of depleted uranium. (Or some other simile suggesting weight and clumsiness).
