how is enough depend your opinion. Borg with 11 GS is still in GOAT discussion because he is superior at some records. I believe Fed at 12 had already many records in his bag
Yes, of course, I am talking about my opinion, not an objective standard. Borg is one of those I had ahead of Federer back when Fed was on 12. Fed's records at the time were impressive, sure, but I always felt naming him GOAT at the time depended of "future accounting", in other words taking more titles for granted. And the tendency many fans have of wanting to name an active player GOAT. Much more fun seeing him in action than to acknowledge that the GOAT has been retired for some time. I have seen that tendency a lot in several different sports - athletics, swimming, football, golf, cross-country skiing etc.