Welcome! Making these changes to your vehicle becomes addicting so just enjoy the ride haha.
In regards to your questions.. Pretty much any change from what the engineers planned will have a negative impact on reliability. This is something we know and we just accept it but with that said there’s no saying just how much a parts life is shortened. We aren’t chewing anything up regularly if that’s your concern. Typical Subaru lifts have almost no affect on ‘normal’ day to day handling. That kind of lift retains stock springs/dampers so the ride quality is exactly the same. The angle of forces applied to the sway bars is changed due to the incorrect length endlinks but this isn’t easily noticeable. It wasn’t a sports car before and it won’t be after.
So what made you choose the Anderson lift kit over others? more complete? better build quality? Did you install it yourself, or have a shop do it? You spoke towards handling, but what about the ride? The stock set up rides quite smooth.