1) No, it make the queue time longer than it needed to be, and with 1 drop/week people tend to go after different pieces anyways. Select a few pieces that you want and take the one that drops first.

2) No, it works in frontlines because there's only reward at the end. Some people may want clean runs to get drops from 1st or 2nd bosses might make it difficult to fill in all the spots if you start with like 16/24