^ This is a much more nuanced explanation than the previous one. But WYSIWYG is a cultural/local consideration. And any adherence to WYSIWYG begins to "limit modelling opportunities."Is it? When the CGC kit was released, some players asked what part they should use to represent the Chain Cleaver and the Heavy Chain Cleaver because they didn't want to 'get it wrong' (like the official book did, incidently). Some players just need everything to be strictly WYSIWYG and it's easier in a game like Frostgrave where an 'man-at-arms' is carrying a 'hand weapon' than in Necromunda where what looks like a Chain axe can actually be one of three different weapons.
I'll admit that some of my points may ultimately come down to personal preference. 'Sprawling' really does nothing for me.
But at the end of the day, if Game A contains only a chain axe, and Game B contains a chain axe and a chain cleaver, Conversions X, Y, and Z (used to represent a chain axe in Game A) can still represent a chain axe in Game B. They may also be suitable to represent a chain cleaver in Game B, at the player's discretion. But there's no additional modelling imitation in Game B whatsoever.