A lot of people don't realise how expensive it is to run a restaurant these days. The cost of running has risen dramatically and the prices we charge still don't reflect the cost as people can't pay them
I don't agree with tables that close together. But to even the and break even the footfall needs to be massive compared to pre covid times.
Add up, rents, business rates, utilities, food stock, alcohol, then staff wages, national insurance payments, paye payments, pension payments, insurances, corporation tax (if applicable), VAT, music licenses, BID payments, replacing cutlery/glass ware/ furniture/machinery repairs etc, advertising, accountant fees, accounting software fees, the percentage for using card machines plus everything else that may be needed routinely or as a one off. It's not a profitable business anymore unless you are fully booked 7 days of the week. Just the cost of oil soared alone and the utilities together made everything very very hard to keep open.
And don't forget it's not just the business owners. They are responsible for the salaries of the staff and higher costs and less footfall due to the cost of living means needing to pay less staff.
Hence why they cram as many people in as possible!
Not trying to justify it but explaining a possibility.