More important than their militaries, the addition of Sweden and Finland's advanced economies to NATO would be invaluable. As history has shown, economic and military might are inextricably linked.
Also, "not so unconditional" is I think Please-don't-kill-me-Putin code for "if we continue like this, we won't be China's friend. We'll be China's bitch."
I mean seriously, what rational human being can see this as anything resembling an friendship between equals.