Good day

Cars gone in today for its s-tronic oil change and a fuel filter. They’ve said there’s an update due, 23WA-S, which they say is to ensure that any issues with the adblue system are displayed in the car rather than only being revealed under a full diagnostic scan.
Car runs fine and advlue consumption has been steady at 500 miles per litre (ish).
A quicksearch throws up a couple of posts on other forums suggesting that post update cars have lost performance and adblue and fuel consumption has increased.
I’ve declined the update for now, is that sensible or should i have it applied?

cars an avant, facelift , stronic, 2015 ultra.

any insights appreciated.

tia phil