There have been a number of changes since then. As noted, Galaxy does not behave this way on my machine. You can configure it to not start on computer startup and it won't. Galaxy is also not embedded in the installers anymore, so you won't have it automatically install when installing a game. You can also DL via DLer (I did this just last night) and install without Galaxy ever interfering or firing up.

If you install a game via Galaxy, then the desktop icon launcher will start Galaxy every time you start the game. it's easy enough to bypass this behavior if you create a desktop icon from the game's .exe within the game folder (the 'send to desktop' option) and you can then launch the game without Galaxy. If you install as game without using Galaxy, and then later on scan with Galaxy to add it to the list of games on the Galaxy launcher, you can still launch that game without Galaxy firing up if you choose to.

If you want to use Galaxy simply as a fancier DLer, you can do that as well. You can just choose to DL the backup game installers (and you can configure where those are stored). Those backups won't have Galaxy embedded.

Not even that really, it just downloads the files straight to your hard-drive, and unpacks them. That is the "installation". So nothing is really deleted. It doesn't use installers, in the traditional sense, at all. But you are essentially correct.
In the case of how Galaxy was designed.. it very much is.

In the vast majority of cases, copying the _redist folder and the game files, installing the redist and running the game from the .exe file would be enough. There may be a few cases were missing registry entries will cause issues, but it's not that difficult (but a little technical) to repackage the game files, registry, and compile to create your own installer from the game files you already downloaded.

It is likley GOG would offer some kind of feature in Galaxy to take care of this yourself at somepoint. During the early development of Galaxy they talked about keeping games usable without Galaxy, either through install scripts or some other means... it's just they have a lot of features they want to get implemented inside galaxy, and probably feel they will be around long enough to implement something like this in the future. It's probably just not a high priority right this second.

its amazing how angry the pathetic fanboys get when this topic is brought up DAILY. "I blow GoG every day! Do you think I would do that because Im a pathetic piece of sh!t who looks for conflict and 'sides' in every facet of my existence?"

Yeah Right, just like the "one world, one price" right, but you certainly got rid of that in favor of regional discriminating prices because "everyone is doing it" and like with "only complete packages/games" you got rid of that as well once it wasen't useful. Are you actual so dumb that you believe that you wouldn't force galaxy on us the second that "it is no longer convenient to keep offline installers"

With "so dumb" you probably mean some of the customers who believe in "Galaxy will remain optional" assurances in blue forum posts. It's not like the single line by Johny legally obliges GOG to keep Galaxy optional forever. The best is to interpret everything that GOG says as marketing speak and only pay attention to what they do and apply common sense.