Because if everything is fanatical nothing is. Again, do you think that one ethos would give us more meaningful choice?
Again, don't you think 8 points would give us more wide choices? As stated, you don't need to use them all if you don't want to! You'd basically need it to portray such Sci-Fi factions as humanity in W40k (fanatical in every way).
I don't think 1 point is appropriate for the same reason you think 8 is overdoing it, I think 3 points are a nice balance (because you can be fanatical at something or more wide) and 5 undermines the focus that ethoses bring.
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