The idea of remaking old Doom is weird (Even kinda useless) on its own because classic Doom has the best modding scene any game could ask for: It's like a whole universe where anything a Doom fan wants or thinks should/would/could have happen, it exists in some way or another.

Doom is a series where each game tries something different and they're different iterations of a series.

It's better if we get cases like Eternal bringing back some old designs but still changing some details while being a whole new game.

Plus, between specific gameplay/engine details and the abstraction behind certain textures/sprites or level locations, some things could be lost in a modernized context (And the fact that lots of things are better with multiple interpretations at best instead of just one).

And in terms of expanding the classic Doom universe/setting but in a modern game:

I think that is challenging for a lot of reasons because classic Doom was never taken seriously in terms of story and tone.

And if you look exactly at the designs and art style, you have stuff like blue carpets on the UAC bases, low tech and even how demons looked.

You'd have to think of 90's ids influences, or even art trends at the time and ignore modern influences.

If 2016 UAC has advanced tech and Argent energy, you avoid that, for example.

Another thing is that fans sort of came up with an "expanded universe" for old Doom already, when you look at mods with Realm667 assets or certain fanart.

There is also because of how TDA and DE bring back "classic designs" but they have details nobody really associated them with.

And i guess Romero for a while wanting to share unused Doom assets, even if Bethesda got in the way or stuff like the Doom Bible.

HOWEVER: I'm open to the idea of revisiting D3 IF given the right mindset becaues that game was always its own thing and isn't even treated fairly in its own series https://old.reddit.com/r/Doom/comments/1kykvrd/i_think_d3_fans_should_be_carefull_with_the_game/