Is the Bajaj Dominar 400 good for long-distance touring?

Yes, the Bajaj Dominar 400 is good for long-distance touring because of its:

Stable, planted feel at highway speeds

Comfortable, upright riding position

Well-tuned suspension that absorbs potholes and speed breakers

Windscreen and pillion backrest for all-day riding

Its weight works in its favour here by adding stability in crosswinds.