... which is "okay", since you can only access it (the admin web console) from within your wlan/lan (and not the internet) and ofc you can/should change it during setup
Seems fairly secure to me.
On the other hand, a Midcontinent Communications (aka Midco) tech told me the password I wanted to use wasn't secure enough and brainstormed with me for a couple minutes on good SSIDs and passwords while he showed me the web admin interface on my laptop. I was very pleased with his visit and called the local office afterwards to pass along kudos!
Nope. Anyone within range of your wifi router can connect to it and most possibly the first username and password that they will try is admin\admin or admin\password