I honestly don’t have an issue with anyone leaving BA. Crack on! Everyone has different situations and needs and if somewhere else ticks the boxes then go for it! BA is neither better or worse than Easy - it’s impossible to make that distinction for everyone because everyone wants something different.
What I would say is that lots of people leaving is a good thing because the one thing management understand is a rise in training and recruitment costs and so that can only help improve t&c in the long term to promote retention.