I'm not in the business of trying to convince. You are where you are and we are where we are. You are all welcome to join us, we are recruiting.
Sometimes seniority is in the pilots' interest, sometimes it is not. I feel it is a double edged sword most of the time.
When there is a glut of pilots (as there has been for roughly the past 13/14 years in the UK) seniority benefits the companies as it allows them to hammer down on the terms and conditions with all the pilots locked into their jobs to protect their seniority. On the other hand, if there is a glut of pilots where are the better jobs going to be found anyway? So in this case seniority also benefits the pilots as it provides them with an annual increment which at least has them better off each year by rewarding their experience when times may otherwise be hard for them.
When there is a shortage of pilots (as soon there will be, in mega proportions, I sincerely hope) seniority again benefits the companies as it retains a stable workforce who are unable to easily accept what may be better pickings elsewhere as they are locked into their jobs to protect their seniority. On the other hand, as the transfer of labour is far from easy, the shortage bites harder quicker, especially at the bottom end of the food chain and the terms and conditions are forced up relatively quickly as the one thing airline managers cannot afford to do for long is cancel flights because there are insufficient pilots. This improvement in the terms and conditions starts at the bottom and takes a very long time to filter through to the top of the food chain and the net effect, even in a time of shortage is that there is a levelling or redistribution in the spread of terms and conditions between the best jobs and the worst jobs.
I am sure that there will be issues that I haven't thought of, but overall, I would have to suggest that seniority benefits the comanies much more than the pilots.
A slight thread drift from Pensions here so it must be remembered that whatever were to happen to seniority, many will feel 'chained' to BA because of the legacy FSS pension scheme which is now almost completely unavailable anywhere else as all the schemes are closed to new entrants.