As mentioned, there are certain crew that do a shortcut and only offers it during the bar service as it saves them time. I think it's ridicilious not to offer it during the meal service. I usually also ask them whether they like Bordeaux or Chardonnay and the passengers seem to enjoy that choice! Still, I once had a purser that said I shouldn't do that as it takes far too much time...
I wonder what proportion of total crew are the "certain crew that do a shortcut." Judging by the number of people (out of a very small sample size) who have recently posted on this thread that it takes place, this proportion might be rather high?
On great days BA crews can be amongst the best in the world. However, they can be very inconsistent - even up the front.