Well his argument is not really the dot at the end, but rather whether the first line of the commit message is a title to the rest of it or whether it is a one-sentence synopsis of the changeset. Examples respectively:
1)
Fix layout.
Replace proprietary grid layout w/ that of Bootstrap,
so that it is easier to manage and use. [...]
2)
Substitute Bootstrap for proprietary grid.
The proprietary grid system was abandoned for Bootstrap,
as it will let us focus on the more peculiar stuff of the
UI.
1)
2)