True, but you would find out this had happened and set it back. Also, none of your devices would be on the reset network, so the worst that the attacker could do is use your internet allowance. Far more dangerous is the attacker who shoulder-surfs the password, logs in and finds out information about your network, connected devices and is able to change your firewall, open ports etc, all without you realising this has happened.
How many years has this been, for what, a simple attribute change on a input box... I used tampermonkey fix by ntyze to make this change for me (device specific so not ideal).
The fact here is that you have 6 pages on a forum spanning years, with multiple people from the industry making complaints (myself included), advising how this is a basic issue, a pretty standard practice (security wise) and its still not been resolved, it would take all of 5 mins to modify the html input box attribute and mask the password.
This speaks volumes to virgin media as a company and their customer service. Well done VM, <slow clap>.