It would be interesting to learn how they are going to solve the problems of relatively high apogee orbits. For example, what's going to be done with space junk

It would be interesting to learn how they are going to solve the problems of relatively high apogee orbits. For example, what's going to be done with space junk? If they are going to seriously compete with current airline industry, there are many flights and there are many objects to cross orbits with. Or what about levels of radiation in the middle of ballistic trajectory? Another question is of reliability at landing - Zarya spacecraft design was shelved in ~1985 because powered landing alone was deemed to risky - and that's for relatively infrequent government flights, not for passenger industry.