Developers have raised several concerns about Manifest V3 and some of its changes:

The deprecation of chrome.runtime.sendMessage() limits the communication options between content scripts and background scripts. This could make it difficult to implement certain extension functionalities that rely on messaging between these components. Some developers argue that the new port-based messaging system is more complex and restrictive.

The new permissions model limits extensions' access to sensitive data like browsing history. While this aims to improve privacy, it may break extensions that legitimately need access to such data to function. Some developers feel that the permissions are too restrictive and will hinder innovation.

The changes were made abruptly and with limited community consultation. Some developers feel that Google did not adequately consider extension developers and users when designing Manifest V3. There have been requests for Google to delay Manifest V3 to allow for more discussion and feedback.

Overall, there are valid arguments on both sides regarding the pros and cons of Manifest V3. Let me know if you would like me to elaborate on any of the points.
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