BTW I started out, I was paying back Uni loan, paying rent, food etc, and saving for both a house and wedding when I was on under £9k/yr. I didn't save a lot initially, but I DID save money every week, commuted by bicycle rather than bus most days, bought cheap food etc. When we actually married and got our house, I had changed job and earned somewhat more (not huge money but around 15k) but now had commuting costs one way at least daily (DH hours meant we couldn't share both ways) before the tax free commuting scheme came in, mortgage was huge, but we still managed. We had to buy almost all the furniture and white goods for the house (dining table and chairs were a wedding present, kitchen table came from a DGAunt's house being cleared, washing machine and tumble dryer came from another DGAunt downsizing (she needed a washer/dryer in her new house), and we had both gathered some kitchen equipment living away from home).
I see lots of people who need to have the best of everything - on credit. Who can't cook properly - all from jars or takeaways or ready meals. Who replace a pair of trousers if the hem has come undone rather than sewing or ironing wonda-web the hem back into place. Who would never dream of reheeling or resoling a pair of shoes. Who must have a massive tv, games console and all the latest games. ….
My DSis only ever buys chicken breasts - she would never buy a whole chicken (for the same price!) and get a lot more meals from it. Or buy boned chicken thighs (which are cheaper and also tastier!). She also buys her veggies already prepared - which costs her a lot more for that convenience. Peeling a couple of carrots and chopping them takes less than 5 minutes - is it worth more than doubling the cost for that?
Yes there are reasons why debt is needed, especially if on a very low income or an emergency happens so things need fixing or replacing.
But you don't go on 3 holidays per year, all overseas, when your budget allows a week self catering in this country. And yet, that is what lots of people expect to do - think of their happiness today and not worry about tomorrow.