The kind of people who will benefit from these policies aren't the kind who reinvest in their local economies.
Give poor people money, they spend it in local shops, on alcohol, lottery tickets, cigarettes- things which bring in a lot of extra VAT/tax.
Give wealthy people money they go on holiday abroad, buy a house abroad or second home in the uk (pushing out FTBs), invest in foreign shares etc. the money doesn't benefit communities. If they have a lot of money they can afford an accountant who can make sure they avoid as much tax as possible.
That's why there's not 'trickle down'.
Most families in poverty now work. They are poor because of high private rents and being underemployed due to the lack of full time work in low paid sectors eg retail, hospitality, care.
Of the poor who are out of work it is almost always due to caring responsibilities or their own ill health/ disability.
The government could help these issues by having low cost full time childcare for all and better care provision for disabled/ elderly people. They could also change the way carer's allowance works to allow carers to combine work and care (currently a cap of c £120 per earnings).
The government could also push more for employers to employ disabled people and be more punitive towards disability discrimination in the workplace.
If they really wanted to help the economy they would take these measures.
But they don't. They want backhanders to their mates.
It's a corrupt government and has been for years.
This is the real problem.