I think original Doom is basically a First person dungeon crawler with a gun and simplified gameplay with all the RPG stuff out of the way.
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@safiuddinkhan No evidence of that, even in the so-called Doom Bible there's nothing to confirm it.
With Quake though they definitely had some RPG elements in mind — there are traces of it in the code, but according to same traces, they have probably given up on the idea quite early in development 🤷
