@PUO3 Is Jeff Horn the best welterweight because he beat Manny Pacquiao? Mind you, I think he won 7-5, but do I rank that win highly? No, because Manny Pacquiao shouldn't be fighting anymore.
If you want to see what an actual competitive close fight looks like, see Keith Thurman vs Shawn Porter. If Keith was afraid of Danny as early as the second round, then he wouldn't have exchanged with Danny as much as he did in rounds 3-5. The reality of the fight is this: Keith won 8-4 and gave away the last 3. If I recall, he already had his elbow injury at that point. Why not play it safe if you're already the winner? Smarter choice.
The SD wasn't controversial because the clear loser didn't win. The Floyd vs Canelo backlash isn't comparable because it was viewed by a significantly larger audience.