Depends on the baby. Some are nightmarish.
That’s the main thing - each family and each child are different, so it’s kind of hard to base your decision on what you see and hear from others.
Sure, the default for travel shouldn't be it'll be a nightmare though or impossible.
Yeah mine was colicky and every time getting him to sleep involved rocking him for an hour+ while he screamed in my ear. And he woke up so easily. So I spent about 2 hours a day rocking and patting for the first year or so, not checking off a dozen countries on my passport.
Never had a second for some reason.