Actually
The real reason a Dyson should never be used in a church is because they are prone to switching themselves on mid-service, attacking the organist, a priest, and three choir boys, not to mention the lasting effects on a group of visiting girl-guides and a representative of the W.I.
And now a deep breath.
You are young men talking about a mere vacuum cleaner. An object. An appliance -nothing more and nothing less. Whilst your enthusiasm for your subject is worthy of applause, a reality check would not go amiss.
So what if a Dyson may not be the most robust choice for this environment? Certainly that amount of carpeting calls for an upright cleaner. Does it actually matter if a vacuum cleaner wears out quickly, for whatever reason? Only the treasurer of the church can answer that. If he or she says there is money in the kitty to pay for these cleaners to be used, then that is all which matters, aside of course for the comfort of those who have the unenviable job of vacuuming that mass of carpet. What is the point of buying things and not ever using them? No vacuum cleaner is going to steal the thunder of that beautiful church, therefore there is no point buying one for people to admire.
I like Numatic cleaners, I always have. But you wouldn't get me using any cylinder on that amount of carpet, no fear. If anything, the church may benefit from a Numatic and an upright, for differing surfaces, but as I've already said, does it even matter?