Hello dear kameote0628,
i have sensible ears and hear music/ebooks/videos on low volume, around 30 ("Hey Siri, turn volume to thirty", whatever unit this is). This volume is quite quiet. I love to listen like that, especially with active noise cancelling. But, every time my AirPods give me a system-sound or notification-sound, those sounds are way to loud. Those sounds are e. g. Bluetooth-Conncetion, Battery warning, Noise-Cancelling-Mode-Change. Those sounds have a much higher volume than anything i listen to. I can't measure it, so i have to guess that those sounds are around a volume of sixty or seventy (speaking in the "Hey-Siri-Volume-Unit"). Those sounds are at least double as loud as anything i`d like to listen to. If i would listen to songs in a high volume, than i wouldn`t mind those system-sounds. You understand? It is a matter of relativity. Relativ to my personal volumethose system-sounds are to loud.
To your questions:
Q1: Based on the details that you've provided, it is challenging for us to determine if your AirPods Pro is exhibiting unexpected behavior.
A1: My AirPods behave as Apple designed them, having just one stativ volume for system-sounds --> This should be changed to "user-definable"
Q2: Have you had the chance to ask other people to try your AirPods Pro for comparison?
A2.1: Yes, my girlfriend had them in her ears when battery alarm ringed. She was alarmed what that loud sound was.
A2.2: The internet is full of people with the same problem i have.
https://www.reddit.com/r/airpods/comments/ekp9c8/airpods_pro_feedback_sound_too_loud/
https://www.reddit.com/r/airpods/comments/k77gko/why_are_airpods_pro_alerts_so_f_loud/
https://discussions.apple.com/thread/252202112
Q3: Have you recently had the chance to try other AirPods Pro for comparison?
A3: Yes, i had a hardware-refresh (apple care). Same behavior.
Can you get my point? Just a few lines of source-code would help to give AirPods Pro a user-changeable volume for system-sounds.
Take care
Florian