regarding the new calendar i think there are several problems
1. it shortens or eliminates the Apostles' Fast
2. it lengthens the time between the Advent Fast and Lent
3. on the Old Calendar you can have the Annunciation during Holy Week or on Pascha, but this can't happen on the New Calendar
4. on the Old Calendar the 40 Holy Martyrs of Sebaste always fall during Lent and thus their hymns connect their 40 to the 40 days of Lent. on the New Calendar they can come before Lent and thus their hymns make no sense those years.
5. on the Old Calendar St. George is always celebrated after Pascha and thus his hymns connect his victory to Christ's victory but on the New Calendar he can fall during Lent and thus in those years his hymns will make no sense.
6. the change was fueled by ecumenism
7. the Papal calendar was condemned several times by Church councils.
8. there has been no positive consequence of the change for Orthodoxy -- just less asceticism, messing up the previously well-laid out Typikon, and causing schism.
All the above could be cured by the adoption of ALL the revisions of the Julian calendar, i.e. the real spring equinox on real March 21.
On number one, elimination might be a problem, but since it varies I don't see how "shortening" it would.
On number two, so? You seem to claim you want more asceticism.
On number three, it happens on the "Papal Calendar."
On number four, how often does it fall out of Lent, and how, since in those years it falls in the Triodion, does the preparation period of Lent fail to bring up the topic of 40 days?
On number five, in 1983, Pascha was on May 8/April 25 O.S. I would have loved to have been around for the Old Calendarists to explain that one, having made so much about St. George.
On number six, was Milutin Milanković an ecumenist? His aim was calculating the most accurate calendar in existence, which he did.
On number seven, the revised Julian calendar is not the "Papal calendar," so doesn't apply.
On number eight, the Typikon of the Great Church did that, nearly a century before the calendar revision.