24SSDs... Way overkill?

For the the slow intensive tasks, where speed does matter, it'll be mostly a CPU (or GPU) bottleneck anyway, so your HDD probably doesn't matter that much. For tasks like described in the vid, such as opening programs, you really don't need that much speed, because they're fast even with lets say 1 SSD. (I mean like opening MS word in 0.5 secs or 0.05 secs... does it really matter that much to you?)