Local tuner recommending to stay away from decat! Any experienced opinions?

Had my A4 2.0tfsi in for a service the other day at my local specialist and tuner.
Was telling him that I had ordered a decat and was gonna get him to remap it and he was aghast that i was i was going down the decat route and was trying to talk me out of it saying that it would make little difference as well as the obligitory safety chat bout engine lights etc.
I have fitted a decat/race manifold to my last 5 Type-R's of various models(not hating on me ;-0) and this made good gains and prob more than any exhaust/filter combo.
He said a sports cat if i had too and a remap was his recommendation.

Is this a bad move, are Audi's more susceptible to a negative impact from a decat?

Yeah I hear what your saying Bez. Pity as they are local and a VAG specialist/tuner.
Was just checking as I have decatted and flashed my previous Evo 8MR, JDM EP3 Supercharged and JDM Integra DC5 all with obvious bum dyno gains as well as legit dyno gains. Just making sure that Audi's aint prone to having negative effects from a decat.
I am mechanically competant and understand the workings of a CAT but having being out the industry for 10 years was ensuring something wasnt gonna bite mein the ***.