>>96415148
>It is fantasy, and sci-fi like Warhammer 40k that embraces and encourages conversions/kitbashing.

You still need to prove how this is not the case with GW kits? Take the Blooded kit, pic related for example. The first page already shows you so many build options for the very first body (of 10).
And you can use any of the weapon options or arm combinations from the remaining 9 other bodies on him too.
You can also use pretty much any Cadian weapons or heads on that single body.

I am sure, you could, without greenstuff or putty, build this single body into 30+ different miniatures. And that is not even bringing in 3rd party bits compatible with GW Guardsmen.