Too much information is hidden in long commit messages
Where else we are usin...

Too much information is hidden in long commit messages

Where else we are using the extra information. I know, the usernames mentioned in the commit message is used for the credits.

Moving commit credit of the contributors to a separate line at the very end devalues their contribution.

Really? Only the vital information will be the subject of the message, the rest can be written in the body. For example,

Then we can parse the log and obtain the credit users from 3rd line. Or the tool can identify the first line of commit message body. Whichever approach we choose.

Having the # issue number on a separate lines makes it harder to find it.

Issue number is a vital information, and should be put as the subject of message.