It's just my opinion, and I'll concede that it does, by design, help me feel better, but upgrade thinking is regional thinking. I simply don't believe in judging a career by the virtues of the super senior and top job. It is a much better judge of a career to see how the QOL of the bottom job is. That is all that is guaranteed.
Plenty of pilots took jobs at united in 2000 with those 3 year upgrades. Things can and often have gone backwards too- so it's often a moving target- and what it is, isn't what it will be. And what is for one class may be very different for classes later in the year.
This is NOT a slam against legacies or a pro SWA argument. (Our guarantee with a class date is as a reserve FO and our reserve rules have a lot to be desired despite 15 days off. -and why it's a priority during this section 6)
I'm just saying it's more logical to think about what you're guaranteed to experience, not the something better that may or may not happen.