We know that the Pontifical Mass in the Ancient usage celebrated by Cardinal Robert Sarah allowed some things that EF purists simply can't digest.
However, I think that Cardinal Sarah knows that more people will be engaged in the EF Mass if some minor changes are allowed.
Thus, "Jake" on the post on Cardinal Sarah's liberties tells us that there were other liberties taken too.
I think these liberties would open the door to more bishops celebrating this Mass as it is a form of "noble simplicity" that Vatican II actually endorsed.
Here is Jake's comment:
It appears that Cardinal Sarah followed the 1968 Instruction 'Pontificales ritus', i.e. he pontificated sans gloves, buskins and sandals, gremial, and restricted himself to the use of a single mitre.
Moreover, the Cardinal encircled the (rubrically correct) freestanding altar (without gradines or faux tabernacle!) during the incensations. In doing so, the Cardinal, intentionally or not, highlighted that the concept of a freestanding altar (rubrically correct according to the Tridentine books) and the position of the priest vis-à-vis the altar and congregation are two separate issues, which are often conflated.
My final comment: If we want the EF Mass to have more parishes celebrating it, some common sense adjustments should be allowed and Cardinal Sarah is preparing the way!