His consistancy is what does it...
...I really don't think he has been as special/dominance this year
I avoided referring to Hamilton as dominant as I would agree with you that I don't think he has been this year. Certainly an argument for his consistency is that I believe he has equalled his own record of consecutive race finishes in points at 33 races.
Though following the video I looked up some other stats and it has made me question my feeling that Hamilton wasn't as dominate this season.
Considering podiums in 2019 then things look reasonably even (Hamilton 17, Bottas 15, Leclerc 10, Verstappen & Vettel 9.) However race wins, Hamilton looks utterly dominant (Hamilton 11, Bottas 4, Verstappen 3, Leclerc 2, Vettel 1).
Maybe the feeling of Hamilton not being so dominant is down do Ferrari and to some extent Red Bull being closer. In that they've made races feel tighter even if Hamilton ultimately has come out on top. I guess as the old adage goes: There's lies, damn lies and statistics.