Shalott, if any thread ever comprehensively dealt with any question, there would be nothing left to either deepen discussion or allow a new one to begin that has different twists and shades.
Perhaps the simple reason the title of 'Marseille' stuck (rather than 'Lyon' or other place - in addition to 'Tarot'/'Taraux', that may also have been a place-name) is the influential printing of Marteau's (Grimaud) publication of an 'Ancient' Tarot believed to have come from the Marseille area - likely based on the Conver.
If the writings of De Gebelin in the late 18th century had been influential in the naming, another name (such as 'the book of Thoth') may have been taken up with more general usage.
In any case, with the variety of decks termed 'tarot' available, a general description for its particular type became useful for the purposes of identification, and to differentiate it from the various gaming tarot two-headed decks, the more recently appeared Wirth, the Falconnier (egyptian styled), and the predominant Eteilla decks (which were very much to the 19th century what the Waite/Colman Smith was to the 20th).