Technically, you can sell Steam Keys for less. But if you sell Steam Keys somewhere else for cheaper, you need to plan giving Steam Customers the same opportunity at some point.
Steam Key Rules and Guidelines https://partner.steamgames.com/doc/features/keys
I bought Steam Keys for cheaper in different stores, like Humble Bundle. I also got Steam Keys for free from devs/publisher (events, giveaway, press).
And If you don’t mind Steam Keys, you can buy games from GOG or Epic and the price is not always the same as Steam.
You can compare prices in “is there any deal”, they only allow authorized vendors. https://isthereanydeal.com/game/shadows-of-doubt/info/ You can see how the base price of Steam Keys are very similar, but the discount changes from vendors.
I agree, and I am glad we are on the same page.
I just think it is important to highlight missing key-points, that people often misunderstand and can misconstrue, like the devs and lawyers from the now class action from the post. So it is important to clarify to prevent further misinformation.
If you check the historical low on “is there any deal”, often stores have games with historical low lower than Steam’s historical low. From what I saw, the prices are usually around 10%~12% lower.