1. current mains are tanks but i do like basically all melee classes but Monk
2. not really changing role but i will be leveling Gun breaker first
3. same as 2
4. judging from everything ive seen watching multiple videos (more than once) definitely for me (so i guess my answer belongs in C)
5. always willing to try something new i did level RDM at the start of SB i didn't really like casters before but i really don't see myself leveling a new expansion job fresh for the story again after GNB.

when i first started playing i was on the fence about trying tanks but i was one of those people who was drawn by the aesthetic of Drk and (back then) needed to level other tanks for skills and now i love them all
its a good thing about this game though nothing really stops you with trying other roles and new things you like it ?great, you don't? oh well ¯\_(ツ)_/¯ .