I'm looking at houses all over, well in 2 locations. I would say you buy a house, then whatever your budget allows, make the house your own. Paint is cheap enough, so is a carpet cleaner.
Whenever I lived in rented houses, this was a long time ago, on entering and leaving, I would go as far to run a cloth over the skirting, plus switches, etc.
Houses in my home village are crazy money, rather small, plus decorated to the owners taste. Even larger houses vary in condition. I recall apologising to the in-laws as SIL keeps a show home, I don't have the energy for that. FIL said a happy home is a lived in home. I do find SIL's house rather clinical, with many rules that make one 

Another thing is many barely get paid enough to survive, so they may be selling to downsize, to use any remaining equity as part of a pension pot. Older people have a unique taste in a whole array of things, like sexy patterned carpets, the wallpaper that you curse having to strip, walls in a variety of shades of magnolia.
Maybe it could be a bartering point, that you need £5k off the price to decorate and sort things to your standards. The worst they can say is no. When looking at a house, try and ignore the things you can change, try and vision how you would make it look.
After a relative died, one of their children bought the others out. They literally redid everything to their standards, including re-plastering walls. It's the joy of being a buyer.
They do have joint ownership on new houses, plus other incentives, that way you get a blank canvas.