The sefer Taharas HaBayis is R' Ovadia Yosef's comprehensive compendium on hilchos Niddah. It is 3 volumes, with a lot to say about everything, as one would expect from R' Ovadia.
However, there is a serious dearth of material regarding the calculation of vestos. The index in the back has no entries for maseches Niddah 62a - 64b (the primary location of these topics), and a mere 4 or 5 entries for Yoreh De'ah Siman 189, the primary siman in Shulchan Aruch discussing this topic.
Is there any reason that R' Ovadia has such a lack of content on these topics? Does he discuss anywhere why he would direct less attention to it?
(For comparison, Badei HaShulchan has 356 se'ifim and 382 tziyunim, aside from his more in-depth biurim, on Siman 189.)