because its a necessary feature, coincidentally when it gets dark out some may want to save power on their phones!
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It was allowed in the early betas of 9.3, and is very handy at night, where the battery tends to be low, and night shift is the most desired. It's a case of "I used to have it any you took it away, I WANT IT BACK". I am guilty of this too.
While I do use some of those apps and some of them are excellent it would be nice to remove the myriad of others That do nothing for me but take up space. Options please!