Vainamoinen: The auto updater can not be optional, as that's a feature that's undeniably
meant to replace executable patch files. It will become mandatory as developers will immediately delay and then stop delivering actual patches or even patched original game files ("it works on Steam"). In my opinion, implementing an 'auto update' possibility factually means
making it mandatory.
The Witcher 2 and Battle Worlds: Kronos both have automatic updaters. And guess what? You can still grab individual patches, and/or run the game unpatched.
Vainamoinen: "Automatic" here means a loss of control over the downloaded game files. It might be comfortable for some, but is clearly geared towards repeated and constant connection to the publisher's servers, always checking, scanning, updating, without bothering the player with actual info about it. Download once and archive all the patch files - a thing of the past. It's the opposite of what gog should stand for, i.e. the independence of game files from the publishing platform, all the while preserving the emergency feeling of the traditional 'patch'.
You may be interested to know that UPlay currently goes that way. When running the game, if it detects a patch, it downloads it and offers to run it and/or save it. Then on the next run, if it detects a newer patch, it does the same. So for Assassin's Creed III, you end up with an installer and 6 patches, and 4 or 5 DLC installers. No automatic downloading of everything and keeping them up to date.
So, should GOG try to copy UPlay, or should it take the good parts and implement them as they should be implemented?
Vainamoinen: Judging from 25 years of gaming experience, I'll say that less and less developers are willing to deliver a finished game;
25 years. So 2014-25 = 1989. And you have no recollection of critical bugs that games were shipped with, that did require day one patching, but they ended up being month 6 patches, simply because there wasn't a method to distribute the files. Not to mention game breaking bugs, that the patch wasn't compatible with previous saves (Quest for Glory 4, I'm looking at you).