Yes, it is. The fact that it's based on a true story gives it an extra layer of authenticity. The characters seem more real and the events are often more impactful because they actually happened.
It's hard to say for sure. The decision depends on various factors like the popularity and demand for it, as well as the plans of the creators and publishers.
The Dragon Ball Super manga has indeed finished. It wrapped up after covering a significant storyline and providing a satisfying conclusion to the fans.