Church and pomposity

Below is a picture of part of the cover of a pamphlet promoting an upcoming pilgrimage to Knock.

Do most of us today, who speak about 'Mass', not simply refer to it as 'Mass'. Why call it 'Holy Mass'?

Why all the titles given to a provincial?

And a 'homilist'?

Google lists 90 meanings for the acronym TBC.

Is he really the 'Principle Celebrant'?

Right through the pamphlet there is a constant use of upper case letters.

Why such pomposity? Indeed, it seems alienating for the 'ordinary reader'. But that may not be the intended audience, patronising too?