The times we live in, it is better that priests be independent and not in any kind of group.
Priests being "their own boss" or independent is COMPLETELY contrary to the mind of the Catholic Church, especially the Council of Trent.
Archbishop Lefebvre is not a saint and providential because he's "my guy", "on my team", etc. He's providential because he objectively, clearly was. Go read his biography. Read about how he spent time in Africa (that was God's plan of course) and he learned the dangers first-hand of a priest being on his own. That's why +ABL later established the concept of "priories" in the SSPX, where priests would recharge in friendly territory on the regular, and so avoid burnout, isolation, excessive temptations, etc.
The Resistance has inherited this God-given wisdom from +ABL and his order, the SSPX.
+ABL has been vindicated too, as isolated priests are as much in danger in 2026 as they were in +ABL's time, or in the middle ages when the Council of Trent had to correct things by mandating the establishment of "seminaries" for any future priestly formation. But it's hard to form seminaries of priestly formation without organized groups...
I hate to quote Fr. Cekada, but he was right about one thing: the Tridentine Mass needs a Tridentine priest (i.e., one formed at a seminary).
Independent priests are a "thing" because after Vatican II there was chaos; groups didn't exist yet. But as soon as Tradition was able to organize and establish groups, and Traditional bishops began to exist, there was NO LONGER ANY EXCUSE for priests to go it alone, maverick cowboy style, unless they just wanted to "be their own boss".
Being an "Independent priest" is not something a man chooses -- it is more a matter of necessity, as in "I have no choice". Priests should work under and with a bishop AS MUCH AS POSSIBLE, to keep the SPIRIT of their vocation and the mind of the Church as much as possible.