I get GW‘s point here—if you’re playing in one of their stores or tournaments, you’re basically in a commercial for their brand. Sure, their space, their rules. I have cool non-GW proxies, but I understand and I’ll leave them at home for these situations.
The problem that I have is that I am really old, and the shakes fist damn kids that work the counter at those places often don’t recognize anything that isn’t on the shelf right now or in recent memory.
I get that someone in their 20s may not know about Warhammer Historical or Confrontation, and yeah, some of those old chaos sculpts from the 80s can look kinda janky. But Mordheim was not that long ago. If you aren’t sure, you can google the old stuff.
EDIT: The new Death Guard Combat Patrol box has “spare parts” for a plague marine because GW didn’t want to bother with updating the old poxwalker sprues. One guy I played used green stuff and spare bits to turn one into a possessed with tentacles sticking out of the gaps. It looks totally awesome and I’m going to imitate it. But…
He made the mistake of saying that he used the Green Stuff World Tentacle Maker to sculpt the tentacles. Wrong answer, take it off the table.
Luckily I found a good independent retailer with great tables who doesn’t care what you play, so long as you pay the table fees.