I think the biggest thing that anyone can PHYSICALLY do, is understand and adhere to calorie counts. You don't have to be psycho about it forever. I only used an app to count for maybe a month before I got a good understanding of what my daily intake needed to be if I wanted to maintain, lose weight, etc. Even when I "cheat" I manipulate my other caloric intake that day so that it is not as impactful. I have go tos that I eat every day for breakfast, lunch, dinner. I know that I can basically have oatmeal with blueberries and it's going to be around 180-200 calorie. The salad with chicken and Olive Garden dressing that I have for lunch is around 300 calories, etc. If I am going to drink I drink something that will not impact my caloric intake as heavily. It all works out and I'm pretty stringent with it. I don't think I've had a single day since I started the Noom journey in May where I have just said fuck it today I'm eating and drinking whatever I want. I have had lots and lots of days where I've ended the day by ordering pizza. I need to cut that down in 2022, but even on those days I wind up staying pretty close to my daily caloric intake because I basically will do intermittent fasting that day. Maybe I will have a salad and some grapes and that's my only other caloric intake that day. It's become a lifestyle and it's not that difficult to maintain.
Of course, the biggest obstacles are always not physical, they're mental.