I tested 103 triple Snaps+ Focus and 103 Triple Snaps alone. I repeatedly fought Lucky Yi, a beast fable. In 206 Triple Snaps, the ability never missed; however, it was dodged 5 times (4 with focus applied). Unlike 5.1, in 5.2 dodge ends your turn.
The average number of Triple Snaps using Focus was 1.84 and the average number of Triple Snaps without Focus was 1.93! Using Focus also extended battles resulting in a Flayer death due to the longer battle. If Focus was simply nerfed, we'd see
Triple Snap+ Focus average something like 2.3 attacks and Triple Snap alone average 1.4, but this is not the case.
Triple Snap appears to have a 100% hit rate. The "miss" component of Triple Snap comes from the number of attacks Triple Snap gets: 1 or 2 Triple Snaps are the ability's "miss." In 5.1, Focus guaranteed 3 Triple Snaps. Blizzard appears to have changed Focus to only increase "hit," which the Triple Snap ability does not need. This makes Focus basically do nothing.
With the reflection nerf and Focus not working, Flayer is rather bad. My Baby Ape, Chuck and Robo Cub will definitely see more action in 5.2.