OH!
I totally ignore the 'recommended weight' stuff, they're typically useless without context for lean body mass - kinda like how I usually ignore BMI.
Even if I was at 15% bodyfat with the same amount of muscle I'd be considered obese in terms of BMI. And you'll notice that their reference materials for the weight ranges are all more than 30yrs old - definitely need to be updated.
As for daily tracking vs. weekly, that's technically true - our bodies don't reset every 24hrs. The idea with that (as I interpret it) is that if you go over one day, you can adjust the next a bit under (or your appetite may do so without interference). General tracking is still necessary, but wiggle room is ok. The same ideas are introduced when tracking different macros, vitamins, minerals, etc.
It definitely comes down to the individual - my recommended calorie count with that calculator is very very close to my maintenance levels, and the macro splits are reasonable IMO. That's why it's still about experimentation: some have faster metabolisms, others slower. Adaptive thermogenesis from weight loss can also skew the numbers for some. At the end of the day, I like TDEE calculations for a baseline to BEGIN our individual experiments.
EDIT: Chamomile, some of your challenge to get in more calories may be because you're eating a vegan diet (ie. lots of high fibre whole foods) - but it also means you can include some tasty healthy fats like more nuts, olive oil, and avocados into your menus without too much angst.