EuroWings
Most people have some form of criteria by which they choose their airline of preference. You obviously have cost very high on your list and I would not criticise you for that. However, other people may have different criteria.
On the subject of cost, it very much depends on when you book. I have noticed on numerous occasions that LS have been cheaper than ZB only to find the reverse a week later. It totally depends on how the bookings are progressing at the time.
Regarding some of the future destinations you identified for LS, I would suggest they would be better or could only be operated profitably as Charter destinations and as such LS involvement would be to operate the flights on behalf of a tour operator such as Jet2 Holidays.