The general recommendation for lchf is for normal amounts of protein, lower carb and more fat to compensate.
There is absolutely no need to eat as much as 600g of meat a day on lchf, and for some of us that amount of gluconeogenesis would be problematic.
If price is a concern, vegetables are much cheaper than meat or fish, gram for gram.
Some people like the idea of eating huge amounts of meat. I don't, and my body doesn't like it either, so i happily fill a plate with 3/4 low carb veg, less than a 1/4 of the plate as protein, and have some butter on the veg.
Even the Diet Doctor menus have more protein than i like, so i skip the protein breakfasts and sometimes reduce the portions in the other meals.