This issue hasn’t come up here in a while, but my understanding is that when an SSPX or sede subdeacon leaves the seminary, for whatever reason, he maintains his obligation to read his daily breviary and remains celibate.
But, when an FSSP seminarian ordained to the subdiaconate leaves, he simply resumes normal secular life, without any obligation regarding his orders.
As well as I can recall, the FSSP’s rationale is that, since there is no such thing as a subdeacon in the modern(ist) church, conferring the order of subdeacon is not valid, but simply an historical ceremony conferring nothing (hence, there is no obligation, or need for dispensation from said obligations upon departure).
Do I have that right?
If so, it raises a number of questions:
1) Is “walking through” such a ceremony in such circuмstances a sacrilege (ie., feigning a sacrament)?
2) Suppose the FSSP was wrong in its rationale, and using an obsolete (yet valid) form would in fact confer the orders, would such an ordination nevertheless be invalidated by defect of intention (ie., How can one who believes the ceremony/ordination he is performing is obsolete nevertheless have the intention to do what the Church does: Ordain)?
3) Is the FSSP correct to dismiss any concern about retaining subdiaconate obligations for departing seminarians, but for the wrong reasons (ie., they have no remaining obligations, not because there’s no longer any such thing as a subdeacon, but because -supposing the ordaining bishop were himself validly consecrated in the old rite- such ordinations would be invalid for lack of proper intention?
4) Which is another way of asking, “Is a denial regarding the existence of the order of subdeacon equivalent to an externally manifested intention NOT to do what the Church does?”