Dear Andrew,
Concelebration is perfectly legal and good.
Perhaps you are not aware that at a Mass concelebrated with priests, each of the priests on the altar has a separate intention.
You said:
I know that in the old days all priests had to say at least one Mass every day, and then maybe assist at the solemn Mass. Nowadays I am not sure how it is.
Priests don't have to celebrate Mass daily now but previously, yes, they were supposed to.
Fr. Jonathan
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