I think the general feeling is to limit the carbs until you get closer to maintenance. Just getting the protein and fluids in is a major accomplishment for a long time, and then adding veggies and some fruit is more than enough. Adding carbs and fatty foods like nuts and nut butters can slow down your weight loss. I reached goal in 7 months, but did not even think of adding a grain based carb, nuts, or nut butters until then. Then I added them very gradually, to ensure I wouldn't start regaining.
I am 18 months out now, and am eating a whole foods plant based (WFPB) diet now. I get all my protein in, but it comes from legumes, whole grains, nuts, seeds, and non dairy milk/yogurt. I eat a lot of carbs now - but they are whole grains, legumes, fruits and veggies - nothing processed. I eat nuts and seeds every day. I also eat 8-10 servings of veggies/fruit every day, so I am NEVER hungry with that much volume. This all to say that there are a lot of different ways to eat after surgery, but initially, until you reach goal, you need to stick to your protein, water, legumes, veggies. The other stuff can come later.
The first 6 months are where you are going to lose a lot of weight. The first year is the golden year, and you want to maximize the opportunity to lose as much as you can during that time. After 12-18 months (sometimes sooner, sometimes later), the weight loss will slow down, your body will start absorbing nutrients more easily, you will lose the tight restriction, and all your new lifestyle modifications will be the real tools you will use to maintain your new weight. The surgery gets the weight off, but you need to do the rest. Don't waste those first months. Hold off on maintenance foods like grain based carbs, starchy vegetables, and nuts/nut butters until you are ready to stop losing and start maintaining. Just my 2 cents worth. I'm sure others will have different ideas.