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Initial normal user's groups of Jessie installation and adduser command default behavior

About two months ago, I installed Debian Jessie (8.1) to the another second-handed laptop PC.
 During the install process, I made a non-root normal user account as the installer guided me.

One day,  I wanted to add another normal user. Because the Debian system recommendation is to use adduser command, I reviewed its usage and functions.
Then I found that the groups to which the initial account belonged were different from the adduser command default groups.

I feel peculiar at first, and added the following line to /etc/adduser.conf

EXTRA_GROUPS="dialout cdrom floppy audio dip video plugdev netdev lpadmin scanner bluetooth"

Then the following command works as expected:

adduser --add_extra_groups [new uid]

I guess if the tasksel changes the extra-groups default parameters depending on the the purpose of the installation, it is more convenient to the users, at least, to me.
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