Series should be at least 3 matches, so winner can be decided.
Ideally SA vs IND series should be 4 match series, we might even cross the finishing line if it happens but tough to sustain because of financial reasons. Don't get me wrong SA did earn a big amount from this one month tour, close to $55-$60 Million but the majority of it came from the white ball series. Tests finishing in 2 days are also not helping the long series narrative, it took only 5 days to wrap up 2 test matches, and broadcasters or spectators (if any) paid for 10 days of test cricket.
That's why SA's board downgraded 3 matches into 2 match series and added extra white ball cricket.
India actually defeated the proteas in Cape Town which is a pretty big achievement. They couldn't win the series, but they drew it implying that both teams ended up sharing the cup at the end.
Dean Elgar has retired from tests in style and Siraj is the man of the match. Crazy test series overall!
From an Indian perspective, it's hardly a big achievement because the target is winning the series which Indians repeatedly failed despite having a good team.