I'm not saying they can't do it, and I'm not saying they shouldn't do it, or people shouldn't request NG+. BUT comparing NG+ in other games to NG+ in CP2077 is a bit unfair, especially depending on the type of game it is.
Plenty of games with NG+ don't have skill checks, that's a big feature they need to balance, Doors, access points, Dialogue choices, etc... all need to be adjusted in a way that's fair but challenging, can't just "Bump the numbers up" like with some other things.
Body mods are a big part of the game and story and in the intro V has almost none, so the entire intro which is a relatively slow-paced string of tutorials that slowly get V a few very basic pieces of Cyberware, would need to be reworked. Even IF they don't change any of the dialogue to accommodate for this, and we all just agree to ignore it, they still need to rebalance the missions. And IF they DO account for this, stuff will basically need to be done completely different, new conversation options, different enemy behavior beyond just buffing the stats, removed or added sections to make it make sense narratively. Not to mention another set of systems that need to be managed on top of attributes, perks, clothing and weapons. It's a lot of moving parts.
As for the direct comparison to TW3 because "TW3 got NG+ only a few months later" Yeah CDPR made both of them, and yeah, they're both RPGS, but TW3 was relatively simple, you had swords and signs, that was pretty much it, the combat systems in CP2077 are much more complicated. more status effects, more weapon variety, more skills. Plus, the armor/clothing sets, a lot more of them. For a good NG+ everything needs to work, and let's face it CDPR would be crazy to release a broken NG+.
So having said all that, I do think probably they are working on it, NG+ is a heavily requested feature, and they probably won't rush it or even announce until they are 100% sure they can deliver. It's just a bigger task than TW3 and, honestly, with everything else the game needed post launch it was probably low on priority until other things were ironed out even thought it was heavily requested. Also, they're just now getting Transmog in the game, and just announced vehicle combat and a police system over hall coming in (presumably) the next free update. Which are features people think should have been in the game from day one. So, it's not like they aren't continually adding these things, we all know the game launched unfinished and broken, but they are putting in the work and if we've stuck around this long, why rush anything? we already saw the rushed product, and what we're getting now is miles ahead of where what we had. I will say this though to not overly defend CDPR when a little criticism is fair, showing gorilla arms in the patch 1.6 trailer, during the prologue "6 Months" cutscene was a bad call, it got people hopes WAAAAAAYYYYY UP that NG+ was coming with the patch, and honestly it wasn't even a different "cool thing" it was a nothing, and that definitely didn't help the topic.