I get the impression they mean for it to be a parallel to what the Horus Heresy is for 40K.
Horus Heresy minis can be used in 40k because they’re still space marines, but the old world and AOS has a major aesthetic change. Do they still allow proxy in AOS? I remeber they had sheets for WH units in AOS when it first came out.
Tired is enough.
I like tiny miniatures