The Issue with the term "Modern O" is that a SEGMENT of Moder O is what we called on Avodah - "O-Lite". They keep Shabbat and Kashrut but are not z'heerim on many things EG
• N'tillat Yadayaim
• Davening with a Minyan
• Learning Torah
Centrist to me implies more - a "modern thinker" combined with Traditional Observance.
Par Example, Think of
R YD Soloveichik
Rav AY Kook
If I could found a new movement it would be an "open-minded" Orthodoxy SANS the Liberal Halachic agenda that has recently grown attached to that appellation
Unfortunately for me, the current crop of Open-Minded Orthodox have used this as a license to revise traditional practice. And indeed, I must therefore truly consider that this is an inherent danger in that enterprise.
Perhaps only R Azriel Hidesheimer and his followers were the one school that could pull off a completely Traditional Observance while tackling such controversial issues such as Biblical Criticism. Even R Hirsch himself was suspicious of pulling this off.
The JTS's - both in Breslau and in NYC, have imho used modern scholarship to compromise Traditional Observance by implementing a Liberalization of Observance. Success in textual criticism has succeeded there at the expense of Piety.
And thus We bear witness - through the prism of History - that this has taken them off-the-derech.
The question remains, CAN we have an open-mindedness without compromising our fealty to Halachah, without fostering a campaign to Revise or Reform "orthodoxy"
It's tricky. I have not seen it done on a large scale. Maybe the nature of Open-mindedness - especially in North America - will inevitably undermine strict Observance. And Only in a more rigidified society like 19th Century Germany, such open-mindedness did not succeed in tempting the highly Traditional types to sway.
And what we call this movement? Pious Modernists? Critical Traditionalists?