It’s not my worry, but it would seem to me that things get more complicated, rather than less, when you try to apply this new ruling from Rome.
The Bishops Conference of England and Wales have received a clarification from the Pontifical Commission Ecclesia Dei to the effect that
in the Roman Rite, whichever Form of the liturgy is being celebrated, the Holydays of Obligation are held in common. Where the obligation has been removed and the Holyday transferred to the Sunday, the Epiphany of the Lord, the Ascension of the Lord and Corpus Christ, this is to be followed in both Ordinary and Extraordinary celebrations of Mass.
The Conference also provides a page giving exact details.
However, it would seem that this could get rather tricky, as it would mean that (for eg.) last Friday would have been celebrated as the “Friday after the Ascension” in the Extraordinary Form when the Ascension was still to be celebrated on the Sunday coming. Does this not mean that a whole set of new propers would need to be written to fill in the “extra days” when a feast is shifted to a Sunday?
And I can just imagine what Fr Z. has to say about this ruling that even when he uses his beloved Extraordinary Form he has to celebrate “Ascension Thursday Sunday”!
And by the way, what do they mean when they say “Where the obligation has been removed and the Holyday transferred to the Sunday”? Doesn’t the obligation still remain even if it now coincides with the equal obligation of Sunday Observance?