As the topic states, I think restaurants should not accept parties of more than 4 people. Nothing pisses me off more than when a group of 12 come into a restaurant. This means they often have to rearrange tables to accommodate them, and it causes everyone else to have to wait even more because they take up the tables space that 3 other small groups couldve had causing everyone else to have to wait longer.
Additionally, when large parties come in, it takes additional staff to serve them creating shittier service for other people (longer waits for drink refills if they ever do come to give you one, longer time to wait for dessert order, longer wait for the bill, and longer wait for receipt).
Large groups of people are also loud causing audible disturbances to everyone around them because they feel the need to shout from one end of the table to the other to talk to each other, and lastly they almost always want serparate checks (takes too much of the server's time) for everyone and rarely leave a good tip (which is why some restaurants demand a gratuity for parties of 8 or more (which should also be illegal because tips are voluntary and you arent allowed to charge different people different prices for the same thing. They are paying more for the same food as the people next to them just because they want to sit together)