You're just responsible. There's a lot of physical cards you still need to function as an adult and, quite frankly, half of them come up when you're in a car accident and if your plan for that is "it's on my phone" your plan is bad.
There's no guarantee either your phone or your skull won't be cracked when that happens, if nothing else.
Err Windows xp launched in October 2001, not the 90's. The 'successor' version, Vista, launched in 2007, really only for home use. Windows 7, the successor for schools, offices etc, released 2009.