That would be bad enough if it was a guest bed
Actually, if tactfully phrased, it could be very useful information about a guest bed. In the 1950s my parents bought a very expensive and stylish sofa with a backrest that can be flipped over to turn it into a single bed. It did good service both as sofa and guest bed for many decades - my parents were quite happy to have hordes of their children's school or university friends descend with sleeping bags at weekends - and I sometimes slept on it myself when later they moved to a smaller house. Eventually, when I and DH moved to a larger house, they gave it to me. So a couple of years ago when we had a bunch of friends staying I showed the only singleton to this sofa-bed and said 'here you go, I promise you it's really comfy'; but next morning she said 'I'm afraid it really isn't'. I had a look at it and she wasn't kidding - the synthetic strapping supporting the seat cushion had perished, so it was like a hammock. I apologised profusely and got an upholsterer to replace the strapping and he said 'Yes, I see that very often - that particular synthetic rubber was used in upholstery a lot in the 1950s and '60s, and it works like a dream for 50 or 60 years, then it perishes quite suddenly'.
We hadn't registered this because when we sit on that sofa we have a lot of cushions on it: it wasn't till we took the cushions off, flipped the backrest and lay down on it -not something one normally does in one's own house - that it felt very, very wrong! And if our friend hadn't been frank enough to tell us, heaven knows how many other friends we might have put through a wretchedly uncomfortable night.