Breja: A browser is necessary because it actually is necessary. As in, it's impossible to access your account without it, to do anything without it. But the Steam client is not. It is made to be necessary. It's an artificially added requirement.
I have no idea why you think that the tool (client) used to log into your account and download your game has any bearing on whether the game can be considered to have DRM. That just doesn't make any sense.
Breja: To use your analogy about bringing the game home from a store, it's as if to play the game I was required to call a cab to go to and back from the store, and only a cab of one, specific company.
Why would that be "DRM"? It doesn't matter how you are made to bring the game home, it only matters what you are made to do after you have the game in your possession (at your home).
Sure it may be more convenient to you that you are given more choices how to deliver it to your home, but still it has absolutely nothing to do with DRM. I already said before that browser downloads may be more convenient for some people, e.g. you can download your GOG games even with an Android device which you can't do with Steam or Galaxy clients.
Let's use another analogy. You buy a physical retail game from an online store, and the only way they can deliver it to you is to use your national post office network. So you can't tell them to e.g. bring it to you using DHL, or go to their online store yourself to pick it up with you own car. Only one way, using the national post office (snail mail).
Is that DRM? According to your logic it is because you are given only one option for the delivery.
Breja: And the GOG donwloader was optional, as in actually truly, fully optional, so what in the hell has it got to do with anything?
So if it had been the only way to download GOG games, would that have meant all GOG games would have suddenly had DRM? Including those I have already downloaded before?
Interesting how people (like me) to whom DRM-free matters, didn't have any objections on using such a downloader client which is supposed to make the games DRM games.
I still can't understand your logic that having several different client options (e.g. web browsers, or the GOG Downloader) to download your games has anything to do with DRM. If there were two different kinds of Steam clients (with which you can download your games), would you then consider Steam games DRM-free? (Actually I do think there is some third-party tool to also download your Steam game files, but you just can't install nor play them with it, for that you still need the original Steam client. Someone mentioned that tool in some other discussion before.).
Breja: A browser is necessary because it actually is necessary. As in, it's impossible to access your account without it, to do anything without it. But the Steam client is not. It is made to be necessary. It's an artificially added requirement.
Another thing for you to ponder, since you concentrate so much on which kind of client is needed to access your games (a browser, or a store-specific client like Steam or Galaxy).
Let's say that in order to, not just to download, but also to install and play your GOG games, you'd always have to log into your GOG account using a web browser. So, you want to play Baldur's Gate which you have already installed your PC, but before you can run it, you need to log into your GOG account with any web browser.
Would you consider such games DRM-free? I wouldn't because it requires you to log into an online account every time you wanted to either install or play the game. It is irrelevant which tool you are allowed to use for this log in.
You, on the other hand, seem to suggest that since that log in is made with a generic web browser (and not a specific store client), it is not DRM.
Stop concentrating on the tool itself, it is irrelevant. The only thing what is relevant is WHEN you are required to log into your account. If it is only for the delivery of the product (to e.g. download your game), but not for installing or running the game, then it is not DRM. Period.