My experience: Macros are for health goals/fitness goals/personal preference and compliance to calories (satiation). I have played around a lot with my macros in my 1 year of weight loss and 3+ years of maintenance for the aforementioned reasons.

The difference between weight loss and maintenance, is calories. The only thing I "needed" to adjust to cease losing pounds on the scale, was calories. For me it wasn't much as a 5'6", 140 pound, 60 year old female. I increased calories about 300 since I never had a severe deficit though lost on average 1.25 pounds per week. That was it. 300 calories. I have found that I also need to maintain the same general activity level (mostly brisk walking) if I am to maintain on those calories. Also, I found it no harder to lose the last 10 pounds than the firtst 53. My experience.

I've played around with all the outside on line calculators. For me, they average around what MFP provides in regards to calories. I've stuck with MFP numbers though if another worked for you, no reason to not stick with it.

Weight loss percentages were set to 40% carbs, 30% protein and 30% fats. I really didn't pay much attention to them and focused on calories for a year of loss and about 2 years of maintenance. In 2016, I discovered medically therapeutic ketogenic for neurology and trialed it for a year keeping my fat intake ratio at least 3 times the combined carbs and protein which in percentages was 5% carbs and 20% protein as VERY STRICT MAXIMUMS and minimum of 75% fat. I don't recall the grams. It can be easily figured out on 1500 calories.

At maintenance calories I neither gain nor lose other than typical daily fluctuations of a pound or two regardless of how my macros have been set. Currently I have carbs set to 15% (57 grams) as preference and for craving minimization. Fats and proteins fall around 100 grams on average for each. My preference and satiation factor usually has me higher on fats than protein.

TL:DR I'd keep your macros the same as they are now as you ease into maintenance. Once stable and confident, play around with them to your liking for health/fitness goals as well as personal preference/satiation and cravings.

I adjusted my goals up after losing about 5% bodyfat...then I gained on vacation...then wasn't losing after vacation, so I adjusted them down again.

I would say if you have not hit a plateau for at least 3 weeks, then there's not a lot of reason to adjust. However, if you have been stalled for 3 weeks, then maybe it's time to look at how well you are actually meeting your goals, and if you are meeting your goals most of the time, then adjust the goals.

Of course, the best goals in the world are of little use if you don't meet them.

My macros got adjusted roughly once every 4-6 months during my weight-loss phase, and then once again when I transitioned over from weight-loss into weight-maintenance. There is no hard and fast rule about when you need to change your macros. Change them whenever you want, as often as you want...as long as it works for you.