The EF had many options as well, according to the level of celebration: Low Mass, Missa Cantata, with or without deacon/subdeacon, with our without public, facing the public or facing away from the public (yes facing the public did happen in EF days), to name the important ones. Of course within each of those options the choices were set, but there certainly were different formulae for different circumstances.
There were also optional musical selections for Masses in Gregorian chant, for example on ordinary Sundays there were two Kyrie melodies one could use for Mass XI; same for Sundays of Advent and Lent (Mass XVII). The same with some feasts. Now in the OF there are two other settings that are optional, Mass XIII and XIV. They aren’t new, but using them on ordinary Sundays is.
Plus 5 optional Credo settings, and a number of other ad libitum Kyries that could be used.
So still a bewildering array of choices, albeit in other places.