WHY CAN'T WE EMBRACE A FULLER EXPRESSION OF LITURGICAL DIVERSITY? ARE WE RIGID DOCTORS OF THE LAW OR A FLEXIBLE SLINKY?

I know it isn't polite to correct the Holy Father, but there is quite a bit of liturgical diversity in the Catholic Church which His Holiness is the visible head. Ecclesial unity is not based upon a single rite and a single rite, as we can see below, can be quite diverse so as not to appear to be even the rite that is being celebrated. 

That all these rites are permitted within the context of ecclesiology and ecclesial unity under the papacy makes one scratch one's head as to why the pre-Vatican II rite of the Church cannot be included in this diversity of unity. 

Maybe the Holy Father would consider making the 1962 Roman Missal more in line with what Vatican II asked? Allow the Liturgy of the Word to have a official vernacular lectionary and that the Liturgy of the Word be celebrated as in the Reformed Mass. What's the problem with that?

Allow Extraordinary Ministers of Holy Communion by way of deacons and officially installed acolytes and as it concerns acolytes allow females. What's the problem with this?

Thus the Roman Missal of 1962 remains as is except for the manner of the Liturgy of the Word and who distributes Holy Communion.

Oh, and yes, allow for some vernacular, only for the changing parts of the Mass. What's the problem with that? 

Here is a very diverse Congolese Rite Mass with Pope Francis for the 14th Sunday in Ordinary Time at Saint Peter's:

 

List of churches sui iuris:

Name	Est.
	Coptic Catholic Church	1741
	Eritrean Catholic Church[3]	2015
	Ethiopian Catholic Church	1846
	Armenian Catholic Church	1742
	Albanian Greek Catholic Church	1628
	Belarusian Greek Catholic Church	1596
	Bulgarian Greek Catholic Church	1861
	Greek Catholic Church of Croatia and Serbia	1611
	Greek Byzantine Catholic Church	1911
	Hungarian Greek Catholic Church	1912
	Italo-Albanian Catholic Church	1784
	Macedonian Greek Catholic Church	2001
	Melkite Greek Catholic Church	1726
	Romanian Greek Catholic Church	1697
	Russian Greek Catholic Church	1905
	Ruthenian Greek Catholic Church	1646
	Slovak Greek Catholic Church	1646
	Ukrainian Greek Catholic Church	1595
	Chaldean Catholic Church	1552
	Syro-Malabar Catholic Church	50s AD
	Maronite Church	4th c.
	Syriac Catholic Church	1781
	Syro-Malankara Catholic Church	1930
	Latin Church	1st c.
	Other	Ordinariates