Many of your concerns are completely justified. Growth is a prerequisite for improved lives for citizens, but it's not a guarantee of an improved life for citizens.
In terms of some or your specific cpoints:
I can see that investment in the NHS, schools, infrastructure etc can help everyone - absolutely. But remember it's also not just about getting to the bare minimum. Healthier populations are likely to be more productive. Well educated populations lead to further long-term growth and stability and, ideally, less crime etc.
but I still can’t make the connection to how that reduces housing costs or improves wages and employment conditions. Well, NHS, schools, infrastructure don't necessarily. Infrastructure can in that it can allow towns to be built in new places, or open opportunities for more housing. Wage increases happen in part when there's competition for workers - ie when there's more work than there are people who are qualified to do the work.
Where is the incentive on companies to prioritise wages/recruit liberally rather than keep headcount minimal to increase profits, dividends, etc. Absolutely NONE except continued profitabiltiy. So even if headcount remains lower today than it would have been for a company of the same size in the past (due to technology etc), the hope would be that the company grows so you do still need more people. Also, different types of jobs open up - eg in technology to support all these snazzy techtools that allow other companies to have fewer people. So as an example, one of the clients I work for has grown their business by about 3x over the last 5 years but they've only increased their headcount by 2x. But they ARE still employing a lot more people AND, they're bringing in a lot of additional services that they didn't use before.
I don’t mean to be all doom and gloom and gloom but am struggling to have faith that corporations will ‘do the right thing for the greater good’ rather than just cut headcount (eg supermarkets introducing self checkouts for cost efficiency - not to create jobs). - As above. You're right, the number of retail jobs drops as a result of self service checkouts. But as the population increases (and hopeflly as money flows more) the volme of goods going through those supermarkets should also increase making the self service checkout a tool for them to be able to process more. Supermarkets may then need to employ more people to do stock taking and logistics, to service the technology etc.
Building social housing is all well and good but it will realistically be many years before we see the benefits. We know that the construction industry is far less interested in building social housing than luxury flats for professional landlords to add to their portfolio. Housing is a huge issue, I couldn't agree more, and it's so bloody slow to implement changes. This is where government will is even more important than in other areas impacted by the generic "growth". To be creative on solutions, to incentivise developers, to direct money to the right places, to support housing development with th eincrease in infrastructure needed from roads to hospitals to schools.
It will be fantastic to see improvements in NHS waiting lists and school properly funded. But it will still leave a lot of people struggling to have enough for basics after rent and bills are paid. Yes. And it' sa huge concern. But as I said at the start, without growth, there is ZERO chance of improvements. At least WITH growth, there are opportunities to see improvement.