They are "incomplete" to offer variety to the new buyer, and a lower cost for the seasoned, without buying things they don't want or need.
Starter sets are often just that; I think you should look to the better locos you really want, enough power you won't cry "more" in a year, and let the stock and command roll in as you can afford it. Your overall purchases will likely be more satisfying long way term that..... auto-"vindictive text" insists that is proper English... I "love" "smart tech" 
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