I also think the official 60% success rate is overestimated.
I personally participated in about 30 LFG groups
Only 4 games were successful.
It is suspected to be a guild group. The commander is the same person. It will always lead the group at one time.
And I have observed. A lot of failed situations where too many people are all dead and won't use WP RES themselves right away. Even if there are many people in the team reminded, they will not do it
Or Dragon's End Contributor did not get the full 10 stacks, resulting in no DPS. Even if the teamwork is very successful, it is a failure