I have been fortunate to fly QF, LH, SQ and BA in F. This was all pre-COVID. Even then, BA wasn’t at the same level as the others. So I think it is a long term decision that BA have made over the last 5 years or so not to give F the attention it deserves. Surely it would not take much to lift it to be competitive with at least the other European carriers?
What is the opposite of diminishing returns?