Yes, theoretically you could see the future this way. It's not really "time travel", any more than we all time traveled from 2020 to now over the last year.
The forces is the correct/complete answer to
Quote:
Why don't the twins have to age at exactly the same rate? The trip is exactly symmetric for the spaceship twin. He simply sees his twin on Earth accelerate, move away near the speed of light slow down and come back.
The forces breaks that symmetry It's not that the aging happens only during the accelerations and decelerations. I skimmed the video and I don't really disagree with what he said. It's just the next step is to ask "which twin stayed in 1 frame the whole time?". And the answer is "the twin that didn't experience any forces".