Why is avoiding initialization vector and key reuse recommended to ensure secure encryption?

Avoiding reuse of the key components of an encryption process means that even if a malicious actor managed to break the encryption for a message or exchange, the next new initialization vector (IV) and key would require an entirely new brute-force attack. Using a new IV and key does not make brute-force attacks impossible, nor does it make brute force easier. A single successful attack would expose a single message, or however much data was encrypted using that IV and key.