I was talking to dh about this yesterday, and I said that the rot started back when I was nursing (I trained in the 80s). Back then the government were closing beds, and closing whole wards, in order to be able to save money on staff costs.
Not only did this mean that there were fewer beds available for patients, but the NHS work force shrank. I think it also meant that fewer nurses were trained - when I trained, the hospital I worked at took in 6 intakes of 30 RGN student nurses per year, plus intakes of similar numbers of SEN nursing students (though that stopped after my first year of training) - and as far as I know, most hospitals of any size had Schools of Nursing - but as capacity fell, I bet the hospitals trained fewer nurses. I wouldn't be surprised to learn that the number of nurses training fell further when it became a degree course.
All this has meant that there are fewer nurses now - so even if the government started building convalescent homes or cottage hospitals, which could offer the step-down care from hospitals that would free up beds in the more acute care areas, where would they find the nurses, physios, doctors etc to staff them?
Basically the NHS has been cut back until it is barely coping with the day to day demands, so when higher levels of demand happen - like every winter, for example, or a crisis like Covid, it is stretched to breaking point, and patient care and staff morale suffer. And staff morale suffering leads to people leaving the caring professions, which only makes staffing levels worse - it's a vicious circle.
We need more nurses, doctors and other healthcare professionals, and we need more capacity in the NHS, so there is spare capacity to cope with crises. And I don't see any government or political party indicating any willingness to spend that sort of money.