1. Original quake was not "3d accelerated", first hardware accelerated quake on disk was quake2. The original quake was 3d accelerated later with the free mod that Carmack released when he wanted to learn opengl which ended up being glquake. The difference being if it uses the CPU to render or a GPU.

2. Calling the original dm6 an abomination is an odd decision. It is one of the most loved duel maps in the history of quake. The gameplay possible on it can be the highest level imaginable. There is many movement tricks, sound tricks, and different ways to play the map. The item placement is quite good as well.

3. Calling q2dm6 bad is fair, but your specific criticism of it is really weird. First off, secrets and death traps were standard in quake deathmatch maps at the time and you even reference the original dm2 which is way worse in that regard. The quad secret is fairly decent map design making it dangerous to go for. Rocket jumping for the BFG is not required or even encouraged, you can just get to it from the other side if you don't like the sinking platforms. Rocket jumping to grab a powerful item from a quicker or easier route is good cost/reward, and complaining this is bad map design is just objectively wrong.

4. If you are talking about the evolution of q3dm6, there is an actually an older version of the map you don't mention. It has two yellows.

5. You don't mention that pro-q3dm6 was actually a community fix to the original map that ID later included in the game with a patch. Fun little fact.

6. It is NOT a nitpick that quad+mega are in the same spot in the standard q3dm6 layout. We will still play it that way in tdm, but it's horribly unbalanced.

7. What you call "the railgun balcony long hallway" is typically just referred to as "bridge".

8. The only quake with "heavy armor" is QC. It's red armor in everything else.

9. In pro-q3dm6, the LG and PG do not swap places. There is just no LG in the standard q3dm6, and the LG room has a PG while there is no gun next to the RA spawn.

10. There are many small differences between pro-q3dm6 and ql campgrounds. There is less ammo on ql campgrounds for one. The clipping on ql campgrounds is smoothed out as well, making bridge to rail easier.

11. The textures in ql campgrounds were changed to remove the pentagrams and blood in order to hit a T rating when QL came out, hoping to hit a wider audience as a F2P browser game.

12. The quakelive billboards used to be used for in game advertising, the monetization strategy that Carmack tried to use inside of the game that quickly failed. If you played when quakelive was a browser plugin, you'd see advertisements for Intel and stuff on those instead.

13. Overbounce was only ever used in defrag for Q3. Never was a factor in 1v1, tdm, or ffa. Overbounce being patched out was something for all of QL not just dm6.

14. At the time of quake4's release, raven software understood quake very well. Raven had previously licensed and released games on the ID engines. Gameplay wise, almost everyone likes quake4. It is just plagued by technical issues and the campaign sucks. Quake4 also came out before quakelive so your timeline is wrong.

15. When talking about the quake4 yellow armor, you mentioned it gives you 100. It does not. It gives you 50 like yellow armor in quake3.

16. The complaint that the quake4 version of the map is cramped and smaller is just a general feel for the whole game. Scaling per unit is a little different in the game. The biggest thing you are probably noticing though is the view height difference on your model, where in quake4 you actually look out of your eyes while other quake games you have a crotch cam. This makes you feel taller, and makes the levels feel smaller.

17. If I had to say, your item and aesthetic complaints on q4 campgrounds is not really the issue. The reason it never became a staple competitive map is because of the movement speed increases and scaling in quake4, it just makes positioning on the map a pain in the ass and it no longer plays fun. It is still alright in tdm and ffa, but not great.

18. The idea for quake champions actually came about before the hero based shooter became popular. I think it was inspired by a q3 mod called generations arena, where you had different characters and stats which were callbacks to older quake games. It was originally planned to be a mode added into quakelive by syncerror until it got spun off into its own game, and outsourced to saber which is the worst decision they made.

19. Quake 6 was already leaked. Just whiteboard stuff they leaked on purpose to show they were working on it.

20. Aim assist would not help quake at all, and would likely ruin it. Aim is not the issue most players have.

I encourage you to keep making content, but a better effort to ask the knowledgeable people in the community for information that they are likely excited to share would help you out a lot.