Logging on every time makes the app much less useful.
It's for the protection of your friends should you lose the device. You can avoid the need to log on by using the screen lock, you can set it for several hours if that is less inconvenient for you.
Apple needs to do a quick login - like the unlock for apps like this.
That wouldn't protect your friends.
Not sure why you are averse to using a screenlock, you run a precarious line by not doing.
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