Very interesting perspective, but I must politely disagree, even though it's extremely smart and deep and thoughtful. I do actually want to see what it would be like if the game had 100% only areas that would eventually be involved in a mission somehow. That would give every single area in the game a deep and special meaning. I have never played a game like that before where "EVERYWHERE" mattered. I don't think anyone or any devs ever tried that before. If every accessible place was extremely important and detailed, and those were the only types of places or areas we could get into, then getting to know the game world of CyberPunk2077 would be even more meaningful and magical since anywhere you go, you will have a good reason to remember it and cherish it as "OH! I know where that place is the NPC is talking about, I remember it!" Like imagine if there was no place that you didn't know, you just knew them all and knew the best way to get their if you thought about it enough, and came up with smart plans to do it. It would make it much more special I think, and what makes this even more interesting (if true) is that if CyberPunk2077 is "Huge" or even just "Large", and every accessible area is important, then that means a loooooooot of missions to fill up all the player-reachable space in the game...... dude.... (if true) mind = blown....
Sorry for the late reply. But it would hugely depend on the number of missions. I'd agree that adding filler territory, EVEN with world building, exploration and immersion in mind, would not be needed if there is a SHITLOAD of missions hence equal amount of explorable areas.