@his dudeness I think that Amex meant that ATC does not require you to fly a speed at threshold, at most it will be at 4Nm final... Or minimum approach speed when established, but never fly 140 to touchdown...
Nevertheless, one dot high is as useless as possible, since like amex mentionned, you have no clue if the one in front is flying one dot high as well.. I was flying out of Ontario,Ca some time ago, watching these 4 holers landing and taking off, I never saw one touching down after the preceeding mark..Could be a domino effect after 5 heavy landing in a row...
Across my carreer, i never saw either ops manual, PartB, Sop's writing that ones has to fly one dot above when following an Heavy, increase the distance , Yes, timing before take Off, yes but not this...mind you I'm quite young in the business, only 20 years..So I have a lot still to see and learn..