Here’s one scenario why:
Person goes to bed with 15% charge left on the battery and forgets to plug in. iPhone automatically updates 26 apps which kills the battery and the phone shuts off completely. In the middle of the night a family member in a crisis, calls that phone- but it just goes to voicemail and the iPhone owner wakes up the next morning, notices his iPhone is dead, plugs it in - and then gets the horrific voicemail message left 7 hours ago.
Very very few apps need to be updated. Almost all app updates provide no improvement and usually make the app worse (in my experience).
In all the years I’ve owned an iPhone (and updated apps) I can’t think of a single app that is better now than it was years ago when I first downloaded it. Updating apps is for the birds (unless you’re forced to do it - financial apps)