Since you have your shipped internal drive still there, you have an option from System Preference>Startup Disk to chose your new SSD as Startup System Drive. You won't have speed loss if you fear. Your new drive will be recognized system drive since you have applied it as Startup Drive. Some Macs shipped with dual drives such as Mid 2011 iMacs shipped with both SSD and HD have clearly recognized SSD as built-in and HD as external drive that can be ejected if you wish to. There is no harm at all. My only concern is that please select your babied SSD as Startup System Drive. This way it is not ejectable.
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Since you have your shipped internal drive still there, you have an option from System Preference>Startup Disk to chose your new SSD as Startup System Drive. You won't have noticeable speed loss if you fear. Your new drive will be recognized system drive since you have applied it as Startup Drive. Some Macs shipped with dual drives such as Mid 2011 iMacs shipped with both SSD and HD have clearly recognized SSD as built-in and HD as external drive that can be ejected if you wish to. There is no harm at all. My only concern is that please select your babied SSD as Startup System Drive. This way it is not ejectable.
Since you have your shipped internal drive still there, you have an option from System Preference>Startup Disk to chose your new SSD as Startup System Drive. You won't have speed loss if you fear. Your new drive will be recognized system drive since you have applied it as Startup Drive. Some Macs shipped with dual drives such as Mid 2011 iMacs shipped with both SSD and HD have clearly recognized SSD as built-in and HD as external drive that can be ejected if you wish to. There is no harm at all. My only concern is that please select your babied SSD as Startup System Drive. This way it is not ejectable.