Most people who own their own homes are desperate for original features, not insisting 50s door frames are removed 
It's those kind of comments that give people a poor impression of council tenants.
I grew up in council/ HA properties. Our flat had no central heating and was full of mould, my mum used to have to bleach clean the walls weekly to remove it. Not ideal, but it was what it was, and better than being homeless.
When we moved to a house, which was admittedly brand new, there was no carpet or curtains, curtain rails or anything else. We were lucky that a relative gave us some rails, curtains were a mix of jumble sale and ones we brought with us from the flat (which weren't quite the right size but they covered the window mostly, so job done). Plenty of our neighbours who had been rehoused from even worse situations, had sheets taped to the windows at first.
Someone we knew was ripping up an old carpet and gave it to us for free, my dad laid that on the stairs. My parents bought bedroom carpet as cheaply as possible, the stuff that is now about 2.50-2.99 a yard. No underlay. It lasted about 10 years by which time they'd saved money for something better. We had no carpet in the living room for about 5 years.
The point is you cut your cloth accordingly. Carpet is a nice to have, but you can easily live in a house without it. It's not ideal, but it's doable if it's a choice between that and say a cooker. Likewise perfectly fitted curtains or blinds. There is a school of thought that everyone must live immediately in perfect homes with everything new, no one saves any more or does a room at a time!
There are plenty of places also as has been said upthread (Facebook Marketplace, Freecycle etc) where you will get offcuts of carpet, rugs, curtains, being given away for free. Larger items too - I've just given a sofa, single bed and a rug away free to someone in need.
You can move in for virtually nothing (only necessity is removal and appliance costs), whether you want to is another matter.