With us it depends on who we are dining with. Sometimes we split the check evenly, sometimes we get separate checks. And sometimes we alternate paying the whole check for everyone.
Everyone has their way that is most comfortable for them. Personally I don't care, thankfully, money isn't a concern for us, anymore.
My husband has a friend and wife who never allowed us to pay for anything. He is very generous. But, this makes us uncomfortable.
We once went on a 10 day vacation with them to Cape Cod and Bar Harbor, Maine. I suggested, each couple place $1000 cash into a purse and use that for food. It worked out well. Everyone ordered what they wanted to and their was no fighting over the check. I paid for the food and tip from the purse.
There was money left over after we came home, so the other lady and I took half each. It was the perfect way to handle going out to eat with friends...no fighting and we all felt it was fair.
Some people take advantage of others when splitting the check 50/50 which as lead to hard feelings, so they now ask for separate checks each and every time with everyone. I can understand that and would not take offense.