Please change need to enter master password every two weeks.

Qutrit

Were you having many people losing their password because they enabled that feature in previous versions where it was already implemented

Yes, we did: thousands; perhaps tens of thousands, but I'll say thousands to be conservative.

and the technical difficulties of incorporating that preference into the lock service were solved?

The complexity issues were not solved. Preferences always add complexity. There are bugs in the 1Password 7 lock service to this day in part due to that complexity.

Ben