Be careful about who "they" is. The people you are responding to on lwn.net are not necessarily the same people who are writing a lot of commit messages for security-related fixes.
If you actually want to change practice in this area, your best bet is to make a lot of security fixes, and to write the commit messages yourself. Another way to improve things would be to offer a separate publication - for example, a list of commits with whatever information about their impact is publicly known, or a tree with commit notes providing that same information.
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