I don't understand what you mean by "streamer product".
Streaming is an activity coming with its own requirements.
Streamers spend 10 hours per day streaming, leaving with little time on the side.
Undedicated streamers are left with demanding products that are straightforward as they have no time to learn how to play. Play as it goes.
As streamers market themselves as proficient players, they often opt for the highest difficulty. Which means that the product must be generic enough for them to succeed without learning much.
Another example: streaming is a social skill based activity. The first job of a streamer is to build a sense of community. No community, no money.
Products must not be engaging so that they do not push themselves between a streamer and his viewers. A streamer must interact with his viewers to spur tipping and subcribing etc
Streamers use video products as a platform to make money, it demands a specific design.
If anything, multiplayer games are more of streamer products. If you check Twitch, you'll see that most of the top games in there are Fortnite, Apex Legends, etc.
No. These games were designed to support a competitive scene, a professional sport scene. Streaming is a by product. They are on the other side of the spectrum: they are made for gamers, they require a high level of skills (the offer is to grow good enough to become a professional player) and require dedication.
Single-player games like this are played by variety streamers which play whatever is new, but by far the most streamers ignore single-player.
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New is not enough. Variety streamers can not afford dedication to a product. They do not sell an exhibition of skills as professional esport players do, they make money by building a sense of community which impose a high level of social interaction. They can not be absorbed so products made for them can not be absorbing.
They must be bland, generic, impersonal, non engaging.