You're getting different answers because people have different expectations.
Some people expect to be able to get coffee and lunch out of the house every day, whereas others think it's a waste of money and probably wouldn't, even if they could easily afford it.
Some people's idea of normal basic grocery shopping is organic everything and unlimited blueberries from Waitrose and obviously that''s rather more expensive than going to Aldi or Tesco with a vague meal plan and buying whatever's on offer.
Some people see using discount codes as miserable and grim, whereas others don't mind, or even enjoy the challenge of getting something for less than full price.
Some people buy their clothes in supermarkets, Matalan etc whereas others go for Hobbs, Karen Millen etc.
Many things can vary wildly in cost and plenty of people are perfectly happy to go for the cheaper options even if they could afford more expensive versions. They'd rather have the savings or work less instead of splashing out on the expensive version of similar things.
That's why some people think it's plenty whereas others think it's a struggle. You just need to work out what sort of people you are as to how comfortable you will be.