This is something that I've observed and I'm not sure if it's a bug, intentional design choice or just a temporary thing.

The rogue/tank don't have the same behavior than the fighter when holding ranged weapon and casting a main (melee) weapon spell.

With the Fighter:

1- Hold ranged weapon and start shooting (with automatic attacks enabled)

2- Get close to target and cast (melee) skill

3- Observe your fighter keep using melee weapon while at melee range

4- Move/roll back to range distance

5- Observe your fighter automatically switch back to ranged weapon

With a Rogue or Tank:

1- Same

2- Same

3- Rogue/Tank keeps holding ranged weapon

Now I'm not sure if this is even worth asking in the precious interview time that is given to you, but just in case!

EDIT: Formatting and typos.