MSQ and Questing features will be a part of the Combat system, which is currently in early beta.
You can read about our progress in this thread: [Beta] Combat
Our community assigned a low priority to Questing features due to inherent danger posed by open-world combat. Therefore we focus on implementing private instance activities and Assist Mode instead.
For additional information about open-world combat, please read this thread:
Asking the community: Thoughts on Open World Combat and User Protection
We will consider your voice in our development plans.
Thank you for your request!