Hello Gajan
Interesting survey and good to know they are trying to improve the system. Here are my answers :

Why is priority boarding valuable to you:
- not having to stand in line;
- being sure you there is enough space left on board for your hand luggage;

Would you rather board as one of the first (which means you have to be at the gate on time, before boarding starts) or board later, using the priority lane to pass the queue?
Answer : both = board first if you are at the gate when boarding starts or, if you arrive later, board using the priority lane to pass the queue

Which scenario would you prefer:
The current boarding process (implemented correctly) starting with priority boarding for premium customers and boarding other passengers after that.

Thanks