Something many people refuse to believe is that "understanding your users" doesn't have to be nefarious or about serving ads.

It's important to realize that key assumptions your app makes (nobody is accessing my b2b saas app from a phone) are incorrect. It's important to understand user workflows.

There are higher touch ways to do this (user research is great!), and you should let users opt out, but someone trying to improve the user experience also needs to understand how users are defying their expectations