Question about Sony WH-CH520

Hello, such specific questions can be asked to YouTubers who specializes on unbiased evaluation of products, including disassembling, pointing out weak points as you raised.
Sony WH-CH520 is an affordable, 50hr use between charging, no noise suppression, general purpose use over the ear headphone, that I use for late night use without disturbing others.
Such use do not need expensive noise suppression or professional qualities.
Please buy it use it and if it breaks before guarantee period or fair usage life, take both case incidents to the vendor and Sony, they will provide you with satisfactory services and your findings can go into their future design policies.
21st century consumer product quality and support services can become Customer driven if customers try working with vendors and manufacturers.