Project Hail Mary

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1) Yes.
2) That was arguably one of the best adjustments the movie script makes. When seeing Rocky's ship, Book Grace is only worried that if its an Aliens situation, the mission to save Earth will fail. Movie Grace is also concerned about his own well being, which matches the bits you mentioned better.
In the books Grace knows that he must be a super brave and selfless person to sign up for a suicide mission, he hasn't remembered anything about how he got there at this point.
 

Cybsled

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It seems like his decision at the end is a lot easier of a one to make knowing what he knows now about his chances of survival on the return trip itself. The long term sleep system is wholly unreliable and you’re on a heavily damaged ship versus helping out the real bro and saving his species as well.

Not only that, but Eridians live even further away from Earth. The trip back would be almost 50% more than his original trip. By the time he got back to Earth, probably 40+ years would have passed.

That being said, not sure what the long term health issues of living on their planet would be. Even in his biosphere, the gravity is much greater there (putting more strain on the body) and if a medical issue happened, the Eridians wouldn't be well versed to be able to help. Grace's ship might have all sorts of medical information I suppose
 

Leadsalad

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Not only that, but Eridians live even further away from Earth. The trip back would be almost 50% more than his original trip. By the time he got back to Earth, probably 40+ years would have passed.

That being said, not sure what the long term health issues of living on their planet would be. Even in his biosphere, the gravity is much greater there (putting more strain on the body) and if a medical issue happened, the Eridians wouldn't be well versed to be able to help. Grace's ship might have all sorts of medical information I suppose
From my understanding, Grace is suffering from the double gravity on their planet, and also had malnutrition/scurvy/etc when he got there until they were able to synthesize food he could consume to get better. He's not going to last very long on their world as it is.
 

Wombat

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Two caveats:
1) I only saw it once, so I may have forgotten dialogue.
2) Again, there's a lot of stuff that was edited out of the movie. Movie Grace writes down something like "Always muscles?" on his whiteboard when he wakes up, and the one shot where he's sleeveless shows beefy arm muscles. The book explains that the Hail Mary traveled to Tau Ceti at 1.5Gs of ac/deceleration, and the med robot exercised them to compensate, but the movie skips over all that. That scene also shows movie Grace also has permanent burn scars over those arms - but in the final cut of the movie Rocky crawled back to his area on his own, so there's no movie explanation / reason for said burns.

In short, the final cut of the movie doesn't really detail Erid's specifics. When movie Grace opens Rocky's first message tube, the smell forces him to throw the tube in a chemical hood - book Erid's atmosphere is mostly methane at hundreds of degrees - but the movie doesn't go into why the contents of the tube are bad, nor are there any side effects when Rocky leaves his area as they leave Adrian. When movie Grace first goes up to the 'airlock' between ships, he's hit with 20 some atmospheres of pressure (which seems like it would do real damage to his ship even if it was human room temperature oxygen), but nothing is said about what type of gases those are.

On the gravity front, book Erid is ~2 times the gravity of earth, and book Grace points out arthritis is kicking in early between the gravity and everything they've gone through. The movie hand waves away gravity issues across the board, even having the ships spin around each other when the 'airlock' is being used to avoid filming those scenes in zero gravity... except the center of the centrifuge where the ships are connected wouldn't have any 'fake gravity' as a result!