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[Debunked] Valve Is Building a 'Steam Console' To Rival PS5 and Xbox, Rumour Claims
(insider-gaming.com)
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There are still advantages to a fixed platform like the Steam Deck. It makes a fixed hardware platform to optimize for. Anything that runs on Deck should also run on another PC.
Likewise, a Steam Box that was popular enough would provide a target hardware platform with higher spec.
Most hardware manufacturers will have too high paced a release schedule, so unlikely to provide a stable hardware spec.