You can't get sunburned from far-UV like you can with normal UVC. It doesn't penetrate deep enough to reach living skin cells (e.g. the (dead) stratum corneum is 10-40 microns on most skin, up to hundreds on e.g. palms and soles) - in human tissue, 222nm penetrates only a few microns, with most of the energy deposited in the first micron; the deepest any degradation was seen in one study was 4,6 microns (for 233nm, it's 16,8 microns). As mentioned earlier, the only cells it can kill are the outermost layer of cells in the eye (corneal epithelium), but they're constantly being shed regardless (the entire corneal epithelium is 5-7 cells thick and has a ~1 week turnover, so on average just over 1 day per cell on the surface).
The comments about material degradation probably are also not true with far-UV. It's certainly ionizing, but again it doesn't penetrate deeply into surfaces . Paint is generally many dozens of microns thick (a typical two coats of interior paint is ~100 microns), while epoxy is typically millimeters or more, so you're only going to be affecting the extreme outermost surface. I doubt you could even tell.
Also, contrary to popular myth (and indeed, our pre-COVID medical understanding), most common communicable diseases (influenza, COVID, most cold viruses, etc) spread by direct airborne transmission, not fomites (surface transmission). So how well surfaces are cleaned has no bearing on this primary means of transmission. That's not that surfaces don't matter - said diseases still *can* be transmitted from fomites, and some other diseases (esp. fecal-oral route ones like norovirus) are still believed to be primarily transmitted via fomites.
Again, honestly, the only thing I would have concerns about are plants. Most plant cuticles are only like 0,1-1 micron thick. Xeriphytes (desert plants) can be thicker, though, like 1-20 microns, and are in general adapted to more UV exposure, so might be able to deal with it. But I'd think a plant with only a 0,1 micron thick cuticle and a 0,1-0,3 micron thick cell wall will get its leaves pretty badly burned by far-UV. I'd expect any epidermis and stomata exposed to the light to be almost entirely killed. But if you had a cactus or plant with really waxy leaves, it might be fine.