why call it 'Part One'?
Surely thats risking some of the potential audience thinking 'well its just half a movie.. And I'm not bothered enough to invest in seeing two movies'
It'll probably pay off as its Tom Cruise/Mission Impossible but imo MI7 should've been just 'Dead Reckoning' and call MI8 something else. (even Dead Reckoning Part II but no Part I)
Avengers 3&4 was originally titled 'Avengers Infinity War Part 1' and 'Infinity War Part 2' before ditching them for Infinty War and Endgame so became like standalone movies (presumably so the audience goes into Infinity War expecting the culmination of the MCU, but then gets thrown by the shock end and then HAD to see the next one.. Had it been called 'Part I' the surprise mightve been affected ) ..
Justice League was also originally going to be Part I & II but then the whole thing got fcuked up anyway.. But had there been another it would've had to been called 'JL: something' (maybe JL Part II?)
Matrix 2/3 didn't do it either (no 'Reloaded Part I')
BTTF II (and Godfather II) was called 'Part II' but really that was just another way of saying 'BTTF II'
Dune wasn't advertised as Part I until after it came out, it was just marketed as "Dune" (unlike 'Dune: Part II')