Because they don’t know what could potentially be running with root access and they’d rather block everything they don’t know.
Earlier this year my accountant asked me to install an app on my phone to give them access to some banking details and that app would not open the login screen without the gboard keyboard enabled, because they considered custom keyboard apps = bad. It also would not let me use password managers, so I was forced to put my banking details beyond a weaker password than any of my online accounts for random sites.
Because they don’t know what could potentially be running with root access and they’d rather block everything they don’t know.
Earlier this year my accountant asked me to install an app on my phone to give them access to some banking details and that app would not open the login screen without the gboard keyboard enabled, because they considered custom keyboard apps = bad. It also would not let me use password managers, so I was forced to put my banking details beyond a weaker password than any of my online accounts for random sites.