That is a common social norm, as bizarre as it seems. I can remember something similar around 2018, it was days, not weeks, but I really had no idea she was expecting me to text her in the days before the planned date. Like good morning. And hows your day.
I don't know you, I don't care about your day, we have never even gone out!
There's also an element of signaling value, with your lack of availibility High value = low availability. I think it's really the opposite, powerful people make their own schedules, but that's another convo. Around 2017, I remember a text convo with someone I met, and she listed her like entire schedule for the week to me, while we were planning a date. And I said something like next week is cool too, and she was like no I can make Thursday, and then named like 5 more plans that week. Well I have yoga Thursday, networking Friday, birthday on Sunday, self care on Monday, girls night on Tuesday.....