They are alphabetical... But not in the right way.
They are alphabetized by
vendor name first, then extension name
We want them listed alphabetically by their display name.
Right now you could have this:
phpbb/boardrules (display name Board Rules)
acme/demo (display name Foobar Demo)
They would appear like this:
As you can image, with somebody having dozens of extensions installed, it will get very hard to find them in the list if they are not alphabetized by their display name.