Kamikaze were a measure so desperate that even the most fanatical militaries normally do not consider it. Note that there is a difference between sending someone on even nearly suicide mission and sending them on a certainly suicide mission.

And of course they were waste of resources, not counting maybe atomics, every concievable payload for a plane/ship/etc. is less worth and easier to replace than the carrying vehicle itself.

Finally, guidance systems are better and easier to access today, so the human bomb is just not necessary for even low grade militaries.