I actually had a similar question / comment but about plants! We have (at least) one in every room in our house and they do wonders for the space.

Not suggesting you go out and buy plants for the gaming rooms (maybe you already have) but wondering if it was a conscious decision not to have any?

Indoor plants are tricky with cats. They will chew on them, and many plants can be poisonous to them. Also keeping them watered is work, and they can create a mess if they grow in the wrong direction.

We have a lot of plants outside, though.