1989:
- Interest rate: 14.5%.
- Average house price: £58k.
- Monthly repayment: £650 (90% LTV, 25 year term).
- Average pre-tax income: £10k.
2024:
- Interest rate: 5.25%.
- Average house price: £282k.
- Monthly repayment: £1500 (90% LTV, 25 year term).
- Average pre-tax income: £35k.
So in 1989, an average mortgage was about 80% of an average gross income. In 2024, an average mortgage is about 50% of an average gross income.
I specifically chose 1989 because it was a year of high interest rates, but you can repeat the calculation for other years if you wish. I don't think the results will support your assertion.