Could add benefits except that the profit imperative means no help for those without enough money. This is the basic fact behind the public sector on all fronts. It's very very simple.
Nonsense - the state routinely uses the private sector for delivery of public services - defence equipment, pharmaceuticals, construction, refuse collection etc etc etc. The state agrees the terms- quality, price, quantity etc - and should be managing delivery.
If the private sector fails to deliver, the state should have a contractual remedy. Relatively few such cases suggests the state is often responsible for inadequate management, changing specifications, planning delays, political interference, lengthy authorisation processes etc.
That the private sector which earns a profit must be uncompetitive does not stand scrutiny. In some (not all) cases it is entirely plausible the private sector through better targeted investment, operational efficiency etc will have a cost base +profit below that of the state sector.
Nobody quite says that. You are just spouting a bit of dogma of your own. The point about the state sector is that it delivers where the private sector often fails to deliver anything at all.
This is why we have the state.
This is why approaching 50% of GDP in modern states is public sector spending.
The state has a history of delivery late and seriously over budget. If they use the private sector to deliver elements of a project, they set terms, prices, investment, service standards etc. State regulation has frequently failed - eg: financial services and banking, energy, water and sewage.
In neither case would I assert the private sector is consistently effective and the state always deficient. I do stand by the assertion that to deny the ability of the private sector to add value (expertise, efficiency etc) to overall public service delivery is dogma driven arrogance.
That the state provides directly, or through private sector contracts, critical services and support is a democratic compromise. That some would support a very different balance (more or less) is a different issue..