Even comparing this brief footage with Doom (2016) and Doom Eternal will easily explain to you why Doom 4 was canceled.
So, it is safe to say that Doom (2016) was probably a much better base for the series in its new direction rather than Doom 4.
You can only spot two demons in the sewer, who are also very different from the typical enemy design of a Doom game.
When it was announced back in 2008, fans were extremely excited for Doom 4 as a brand new entry from the revolutionary shooter series of id Software with cutting-edge visuals at the time.
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Unreleased DOOM 4 [cancelled] & DOOM 2016 Development Gameplay