Rabbits4ever2 after 4 years of trying every bedding possible, and Sophie kicking it out of the sleeping areas, often as soon as I've put it in there, I think it's safe to say that she doesn't want anything comfy to sleep on.
As MissyandMoonlight said; rabbits will remodel to the way they like it. My Sophie especially. If I'm doing anything in what she considers her territory like gardening, cleaning the litter trays, or removing old destroyed cardboard boxes and giving them new ones, she hovers around me, watching like a hawk. When I'm done she investigates and if there's something she doesn't like she changes it.
My rabbits are not locked in solitary confinement. What on earth gave you that idea? Sophie and Milo are a bonded pair. They are outside buns living in a secure shed and run combo (all metal run, no wood and chicken wire). During the day they have access to lawn, digging space, a sand pit for rolling in, branches cut from fruit and safe deciduous trees to gnaw. Bushes, crates and other things to run around and hide under, as well as obviously being able to get back in the shed and hutch via a cat flap. They play and binkie all the time. I've seen Milo, who comes in at 3.6kg (he's big, not fat) do a full 180 in the air... admittedly that may have been the wind making him jump. He's not fond of the wind. Even Sophie, at 9 years old, binkies.
Hana is a rescue with health problems, so is not going to find a better home easily. While she is on her own, she has human contact for most hours of the day and night, plenty of things to keep her occupied, as well places to hide when she's not feeling social, and a "talking wall" to have some interaction with Milo when she gets outdoor time (Sophie hates her, poor wub). We're considering finding her a friend, but currently we have to get her health sorted out... she's got quite the medical history.
My bunnies are happy, and as healthy as can be (Hana's issues aside... we're getting there though). Sophie is 9 and aside from a touch of arthritis that we manage with meloxicam, she's not been ill in the 4 years I've been caring for her. Milo is 7 and has had GI once from eating bread that the neighbours had been feeding to the gulls, but we got him through it. Daily trips to the vet, syringe feeding, painkillers, fluids... I'll do anything for my buns. In fact I took Hana to the vet at 9am for her vaccines and a dental check this morning (back on Wednesday for sedation and work on her wonky back teeth... ech), after 5 hours sleep due to pulling a 14 hour shift (if I sound a little grumpy or incoherent *yawn*), because that was the only appointment on a Saturday they had. Please do not accuse me of not caring for my rabbits based off one remark.