why did the iOS 18.2 update came with bigger emoji?

Turning off Automatic Updates after a failed update will only prevent automatic downloads for the next update, not the current one.

Here's why:

• iPhone remembers your update intent: Once you initiate an update, even if it gets interrupted, your iPhone recognizes your desire to install the latest iOS.
• Automatic Updates act as a convenience: This feature is designed to streamline the update process by automatically downloading new versions in the background. Disabling it simply prevents this automatic download.
• Manual update check still possible: You can still check for updates manually by going to "Settings" > "General" > "Software Update." This will allow you to resume the interrupted update or download a new one if available.

Please check if both Automatic Download and Automatic Install is enabled.

See the pic below which is self-explnatory

Originally people complained that the Emojis were too small, so they made them bigger. By the way, Apple does not read your comments here. If you now think the Emojis are too big, you are welcome to leave Apple feedback here:

⇢ Feedback - iPhone - Apple