Seniority has had its use in days gone by...
Aviation, business models and airline businesses have changed, time to update and remove this nuisance stance.
In most jobs, outside of aviation, progression up the career ladder is done on suitability, experience and loyalty.
Seniority is only based on the last, excluding many of the experienced unfortunates whose job was taken away against their choice.
Seniority requires those very highly experienced pilots to be chucked into the pool of (relatively) inexperienced jobseekers, with no opportunity due age of gaining a position held for many years prior, while young inexperienced joiners are able to take these jobs well before them.
It is not a crew members' fault if a company joined in good faith and with a long standing reputation in the business goes under.
It should not be a further burden to the crew member being unable to find a suitable similar job afterwards due to seniority.
Airlines have not always been open for joining, times changed, in seniority has no place in a modern work environment.
I am sure, legacy carrier pilots who benefit from seniority will disagree with me on this though