Required? No. Recommended? Yes.

With modern hemostatic impregnated gauze there is pretty much no negatives to their use. The benefit: anything we can do to keep as much blood inside the body is a good thing. Hemostatics can be an important adjunct towards that goal in some circumstances. Especially when solo or short handed, hemostatics are time-savers in circumstances where seconds matter.

If you spend a lot of time solo in the back-country, or you are exposed to high-risk activities; you should consider carrying hemostatics in your IFAK.