As posters here have already alluded to, the demographic of your average candidate joining BA has changed.
Errr - well I'd agree it changed in about 1988 or 89, but since then, not much.
There were experienced ex-Forces DEPS and experienced other airline DEPS joining BA in vast numbers from the very late eighties onwards, as were the Prestwick cadets ( equivalent of the FPPS), so there's nothing new about the demography of the more recent recruits. I can promise you BA and some soon others, especially in BALPA, found out those DEPs needed no lessons on how to be "less inclined and/or possibly genuinely less able to deal with the intra-organisational unfairness."......it wasn't long before the term "Whinging Wing Commanders" was coined.
As for the more general stuff:
Change in Payscales/pensions - I'd agree it was wrong.
The current Senority gradient and specifically weekends: - we're obviously at an impasse. Over the years we've
all worked lots of them, kids at home or not. 2 out of every 7 days are weekend days, the Longhaul program doesn't reduce at weekends and being blunt somebody still has to work them, I don't think every weekend for months on end (and I have done that) is fair but despite the claims the vast majority of pilots, even those quite/very senior don't or can't avoid weekend working.
Leave, Christmas, Reserve - there's at least an an element of fairness/flattening of a pure seniority gradient built in by virtue of the various points systems.
Anyhow as far as roster patterns and weekends are concerned talk about how it works under Bidline is all a bit moot and it will be interesting to see how fair JSS is.