True, But
while they give you a dedicated IP for your website that sometimes is not the case for mail as the default for cpanel lets say is the server IP for mail - so the persons with a dedicated IP might still be sending out mail from the shared IP< thus the potential of getting blacklisted is still there
Correct, if you are using a Shared IP address, it might be possible that the IP is Blacklisted due to someone who is using the same IP address. Hence, it is always better to consider a Dedicated IP address for your website. And yes, it is definitely very difficult to get an IP address out of the Blacklist.