Nobody is ever happy...
Kabam could literally give EVERYONE 5 6* crystals for Christmas and someone is going to B&M. End game will say it’s unfair they got the same rewards as new players and say they should have gotten 10.
If Kabam based it on progress in story content new players would B&M because they haven’t cleared to certain objectives.
Heck Kabam could bass it off power rating and you’d have end game players who sold their 1/2/3*’s complaining because now rewards are based on not selling champs.
Nothing will ever be done to make everyone happy. Take your rewards and get over yourselves.