Quick thought re: power levels. I don't think it's so much that they've arbitrarily made Captain Marvel strong, but that she's at comic-accurate levels while some of the other characters have been adjusted. Obviously, this depends on the film and the era of the comics being compared, but I'd say...
Close to comics power levels:
- Captain Marvel
- Captain America
- Iron Man
- Thor (with Stormbreaker)
- Vision (he's strong, but he'll arbitrarily be knocked out of a fight pretty often)
Underpowered compared to the comics:
- Scarlet Witch
- Hulk
- Thor (with Mjolnir), just slightly
- Drax
- Mantis
- Iron Fist (should have been badass)
- Quicksilver
Overpowered compared to the comics:
- Black Panther? (I don't think his suit is as powerful as it has been in the films so far)
- Wolverine (I know it's not MCU but that dude had some absurd escalation over his 17 years of cinema. X-Men 1 he gets knocked out pretty quickly, The Wolverine he takes a sword through the chest without flinching)
I haven't read enough with Falcon, Doctor Strange, Winter Soldier, etc. to compare.
So like I said, I don't think it's so much that they're adding an "I win" button to the cast, but rather that they're adding an accurate, cosmic-level hero to the mix. It also sounds better to say "strongest yet" as opposed to "pretty strong, about as strong as Thor but maybe not as durable."