We can't necessarily survive that well when under acceleration greater than 9.81 metres per second per second for extended periods of time.

Gravity on Earth varies about .7%.

Increasing the acceleration a little bit more than that (eg to 1%) would make a difference.

https://en.wikipedia.org/wiki/Gravity_of_Earth

> "Increasing the acceleration a little bit more than that (eg to 1%) would make a difference."

Wouldn't that be only a few months on a decades-long journey at 1.01G vs 1G??