It’s not shroud waving when virtually every winter routine operations are deferred, OPDs cancelled, it is lack of capacity. I worked in the NHS from 1974-1994 and it was true even back then. The problem, despite all the changes and improvements you cite, is that the politicians like to see low costs and the short-term savings from inadequate capacity at times of peak demand ignores the long-term implications. The position has, of course, been exacerbated by covid-19.
The NHS has been reducing bed numbers for as long as I can remember; a full hospital is an accountant’s dream, a medic’s nightmare.
Also, don’t forget the effect on service demand of an increasing, and increasingly aged, population. In 1974 there 4.9 million UK residents over 75. The figure is now close to 8 million. The greatest quantitative demand on the NHS is posed by the elderly, but sheer numbers also affect demand. The UK population in 1974 was 56.23 million. In 2020 it was 67.87 million – and it is still rising.