The recall opportunity really is something unique for those who got let go during circus. What is amazing is the number of crew who are resigning on their own terms (therefor being removed from the seniority list permanently) to find greener pastures.
Pilots have a lot of opportunities now, so if an employer isn’t meeting the market, people aren’t afraid to move on. Better pay and conditions are available at many employers. Also, it can’t be fun being a training or check captain right now. They must be approaching burnout. Shortly they’ll be training relatively inexperienced pilots too which will only add to the training costs/burden.