i would be wary of any dietician that prescribes the same maintenance caloric amounts to all their patients without taking individual size, weight and metabolic rates into account (among a multitude of other factors!)
i would be especially be wary of any dietician, when asked for a reason for his/her prescription, answers with "i don't know".
as with all things, listen to what you are told and advised, but also make informed decisions on how to deal with your body based on observations of its responses to stimuli (i.e., caloric intake in this case).
the 2000 calorie suggestion is an AVERAGE and does not apply to all. STATISTICALLY, only a small very very small percentage of the population actually requires exactly 2000 calories. the vast majority of the population fall above and below 2000 cals. thats MATH people.
with that said, i am a 5yr post op, 5'2", 51 yr old, currently 117 lb female that maintains at about 1800 cals a day...and has been doing so for about 2+ years.
(i used to maintain at 2300+ cals a day, but i was exercising like a fiend those days so it made sense).
everyone will have varying maintenance calorie levels...if u can figure out yours and adjust as necessary, you are golden.
Good Luck! ❤️