You would encourage me to seek out more balanced sources? What are you even talking about?
Listen, everyone is different. But the guy making this topic isn’t a 120 lb woman, therefore my advice to him wasn’t in reference to that. But okay, let’s talk about that since you’re interested. A quick google search turns up that a sedentary 100 lb woman should be burning a little over 1500 calories a day (TDEE). Does a 1200 calorie a day diet work for her to lose weight? Sure, but at 100 lbs should that really be a concern? Whether it is or isn’t, every 20 lbs you add to that will add roughly 100 more calories. A 500 calorie deficit isn’t necessary to lose weight, 100 calories works, 200 works, etc. A 1000 calorie deficit won’t create double the weight loss of a 500 calorie deficit, why do I mention this? Because when it comes to calorie deficits, bigger isn’t always better. If 1200 calories a day creates a REASONABLE deficit, then sure, it’s fine. However, 1200 calories a day doesn’t create a reasonable deficit for everyone.
If you read my post, or watched the video I provided, you would find your “bottom line” paragraph a bit silly. The scientific research shows that “starvation mode” isn’t a thing. Despite that, the metabolism will slow down more on a harder deficit than a smaller one. It’s also harder to properly fuel the body on a large deficit. Another problem it has is sustainability. There are legitimate reasons why it isn’t recommended. I have absolutely no doubt that @Jeffrey_Long is capable of losing weight at a good rate doing 2000 calories a day. But I recommended for him to run a TDEE Calculator to see approximately what he should be eating, and I recommend the same thing for anyone else. BMR isn’t important, but TDEE is. It’s applicable to everyone and is without a doubt “balanced” advice.