I always go through the MSQ's as a tank, personally. Trusts are a thing now, granted, but trials can be lengthy roadblocks if queuing as a DPS.

I plan to make Reaper into my main, though only once I'm done with the MSQ's. The time it would take to get Reaper from 70 to 80 so I could start the 6.0 MSQ's would cut into the time spend just soaking up the new expansion's zones and story. I'd also rather avoid spoilers, so not getting side-tracked early on ensures that I can focus on completing the MSQ's.