Why do updates change the way my phone operates?

NoLiesplz ~ In order to enhance iPhone with new features, it's inevitable that some current ways of working have to change. Let Apple know what changes you don't like here:

iPhone Feedback

As you mentioned 'wallpaper', I like the new live weather feature: "Glance at live conditions on your Lock Screen as the weather changes throughout the day." ...Here's sunrise, mid-morning and night:

Change the wallpaper on your iPhone - Apple Support

iOS 16 - New Features - Apple

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NoLiesplz wrote:

ph has a mind of its own sometimes.

Smart Phones neither have the intelligence nor the hostility. Hence we need to look at our device settings and the way we synchronise our smartphones with Mac/PC/iCloud and also how careful are we in sharing our sensitive and valuable pieces of information with friends and family members.

Be careful when sharing the device's sensitive and valuable information with friends and family members.

Thumb Rules:

1. Enable Guided Access before handing over an iPhone to kids or to a stranger.
2. Don't share Apple IDs
3. Don't Jailbreak
4. Don't share sensitive information pertaining to your device and payment methods
5. Beware of Phishing
6. Do not leave your iPhone unlocked and unattended in public places like offices, schools, malls etc.