Exactly this.

I had the bed in OPs meme and it was great at first! My cats loved it, they zoomed through day and night. Then one day I noticed only one of the cats would enter at a time and only while I wasn't looking. Eventually I found out one of our cats was holding politically extreme meetings under the bed which eventually resulted in an attempted coup d'etat.

Anyways, great bed. My cats run my house now and I get to sleep under the bed in a cool maze!

After having pets for the last 30 years this was my first thought... oh great, another place for them to leave me "presents" (like poop, vomit, dead mice, etc)

Lifting out a mattress to clean is a huge pain in the ass

It sounds so easy when you say it