It can, and things are better than ever as far as preserving (most) form state, sessions, and scroll positions, but it's not perfect. Just as one example, pages opened on one network (eg at work) won't be able to reload elsewhere unless I take the extra step of connecting to the VPN. This is not the end of the world, but it's an annoying detour when I really just wanted to close that one tab.

And it's so rare that I shut down the whole browser anyway, so it makes sense to me to make it hard to do accidentally.