Portrayal means nothing with the feats says otherwise. Luffy being praising haki since Doflamingo. That means nothing. Doflamingo didn't thought Law could be Vergo because of haki too. Again means nothing.
Bonney didn't affected Saturn because of haki probably. Don't act like she could do it with Big Mom or Kaido.
Portrayal means a lot whether or not your interpretation of the feats say whatever you want to believe. Oda isn't writing Jinbe being amazed at Mars' haki or most of Egghead's relevant fighters getting alerted by the Elders haki because of nothing: throughout the last chapters he has been sending quite an explicit message on how strong the Elders haki is. Again, why do you exactly believe everybody was worried by Saturn's omnious presence? Why do you believe Jinbe found Mars haki to be unreal? Why do you believe Lucci was so interested by that strong haki he and Zoro felt (and was later terrified at Mars)?
Doflamingo didn't assess Law's haki but
assumed Vergo's was stronger with no direct lecture of Law's; the characters in Egghead
know how abnormally strong the Elders haki is because they're assessing it as of now. Your comparison would make sense if Doflamingo was in Punk Hazard and wrongly assessed Law's haki as weaker than Vergo's while Law was in front of him.
Never has Oda hyped someone's haki, bar Shanks, the way he's hyping the Elders now. Quote me one character whose presence has caused so much impact in such a number of strong people (and I mean very strong people, to the point Luffy is a top tier; we aren't in Dressrosa anymore and these aren't New World rookies).
PD: unlike Big Mom or Kaidou, Saturn has been hinted at being immortal along with his fellow Elders and none of them has aged in decades. Nobody has reacted to Marco the way Luffy is reacting to the Elders regeneration. Whatever is going on with these guys, they're pretty clearly immortal in a way that they don't age and can't seemingly be given lasting damage; which is exactly why Bonney's power didn't work.