Honest question have they increased the difficulty on the last 2 campaign boss fights?

Yes! They definitely have. This is because the power of guardians has increased. Power creep is definitely a factor when bungie designs their new content. Just look at Shattered throne compared to any new dungeon

Im not talking about did the power level increase. Just the difficulty of the boss fights. Ive done every campaign boss fight since d1 sure some get killed a few times but the last 2 are a beyond that especially calis fight.