iPhone SEなど、機種によっては壁紙が小さいとホーム画面が暗くなる仕様が残っている可能性があります。
iOS 11 Postscript
Depending on the model such as iPhone SE, there is a possibility that the home screen may still become dark if the wallpaper is small.
Depending on the model such as iPhone SE, there is a possibility that the home screen may still become dark if the wallpaper is small.