I really like Safari. Underrated browser. Unfortunately it lacks one feature that _to me_ is a dealbreaker: a way to have multiple identities/profiles.
Opening the same page in different private tabs accomplishes this. Private tabs are completely isolated. This is how I use multiple accounts.
This is true, but personally I've often found that this also prevents me from forcing a link to open in a new tab (via cmd-click) and have that new tab share cookies with its parent. Clicking on a link with target=_blank does work, though, which actually makes it more annoying that cmd-click does not.
Wow, that's crazy! Was actually going to take a look at Safari, you've saved me some time!