Things I wish I'd had as a kid:
Decent windows - Single pane windows don't keep much heat in and waking up cold with the water by your bed frozen is not fun.
Decorated house - old carpets, tatty wallpaper, 70s tiles and kitchen that's falling to pieces.. I could never invite friends around which meant a lot as a teen.
Decent furniture - everything was old and broken and given to us by well meaning people who had bought new and we got cast offs.
Clothes and shoes - old hand me downs and charity sourced clothes that looked like they were from the 70s... Because they were... i was raised in the 80s and 90s.. I didn't have a new pair of trainers until I was 13.
Colour TV - stupid I know. My friends all had colour, satellite, cable, sky etc I had a tiny black and white with a dial on the front for changing channels.
Heating - the house I was raised in had a gas fire in the living room and the one in each bedroom. That was it. They used to heat the 2 foot in front of it, but that was about it. I knew people with radiators and it was like magic.
Food - the size of the meals my dad cooked never increased from about age 7 or so... But he'd serve it with more and more slices of bread and butter. By around age 14/15 I was having tiny meals with 5 slices of bread and butter to fill me up. (Filling but not the most nutritious)
....
And you know what..
Duvets ... I didn't have a duvet until I moved out of home and bought my own bedding.. until then it was blankets and sheets and old sleeping bags. I used to sleep with clothes on and a beanie hat in the winter some nights.