What is difficult to understand about this?
People start off in jobs, maybe flat share, rent, buy a small property. Move up the ladder at work, start a family, buy a bigger house, bigger mortgage, bigger outgoings, more treats because they can, holidays etc. then interest rates go up, cost of living increases, and everyone has to start cutting back. Apart from the seriously wealthy I suppose.
It's all relative. And it's personal. My £2k a month might not pay someone else's mortgage, let alone all the other stuff. My £2k a month might sound like millions if you only have £1k a month. My £2k a month is increasingly smaller and smaller as the months go by. So, whilst I have a nice 4 bed detached in a leafy suburb and a nice wardrobe from my working days without children and probably look 'loaded' to some people, I'm skint. I haven't bought anything extra for nearly a year, no clothes for longer than that. I buy secondhand when I can and I sell stuff I don't need. The council tax is £250 and utilities £235, that's a quarter of the income gone before anything else is paid.
We aren't high earners but I am perfectly able to understand why other people, who on paper look like they should be managing just fine, are feeling the struggle too. You have no idea of other peoples commitments so why even give it headspace.