Here in the UK we can use VA treatment every night if necessary. As well as applying KY Jelly, 'yes' or 'sylc' products in the outer labia/vulval regions. Some ladies get by with several times a night of insertion with 'vagifem' and 'estriol' smeared on the clitoris area. It depends on which symptoms are most bothersome.
The body doesn't 'expect' anything in the way of replacement - as oestrogen levels fall so the body may become dry: inside and out; skin, scalp, between the toes, deep in the ears, eyes, vagina ......... keeping any parts of the body moist to prevent itching or splitting of skin is important. Using VA treatment isn't much different 4 me as putting on hand cream .
The body doesn't 'expect' anything in the way that the gut expects to be fed.
When VA bothers me I up the treatment until symptoms settle.