See: https://www.differencebetween.com/difference-between-ocean-l...
https://oppositelock.kinja.com/the-last-surviving-transatlan...
Plenty of passenger ships - to give a concrete example, the Spirit class - routinely make transoceanic crossings at a reasonable speed following schedules published years in advance. Perhaps a little slower than the QM2. Perhaps with slightly more onboard amenities. But I can see no clear distinction that justifies this talk of the QM2 being somehow "the last" and qualitatively different from these other ships that do very much the same thing in practice.
"Bob is the last sheep"
"But I see all these four-legged ruminants wandering around eating grass, what about them?"
"Those are goats"
"You don't seem to have engaged with the discussion..."
"Bob is the last sheep"
"But I see all these four-legged ruminants wandering around eating grass, what about them?"
"Those are goats"
"We're shearing them and gathering wool from them; doesn't that make them sheep?"
"Bob is the last sheep"
"You don't seem to have engaged with the discussion..."