The idea is that a socialist/communist utopia wouldn't concern itself with the pursuit and hoarding of capital. So the "showroom" wouldn't really be a concept. We'd have catalogues and stores, but the fancy aspirational dressing that comes with the wastes of space known as furniture stores would be less prevalent.

But there is the assumption that bed showrooms need to be filled with inventory so that people can decide what bed they want to buy while others don't even have a bed.

I'm not communist because I think skill and effort should be rewarded. But I guess you could say I'm basic need communist in that I think society should do their best to ensure everyone has their basic needs met and rewards those supplying those basic needs beyond their own basic needs.

Luxury options and upgrades should be waiting until after everyone has the base version. And that base version should be efficiently and effectively designed, not designed deliberately to make the user want to upgrade.

Then you missed the point.