Its not Dark Mode, and if you even think it is, you don't understand things.
Dark Mode is far too complex and messy to even be considered for 10.x update. And personally I don't think, at all, ever. not without a major commitment from Apple to completely overhaul the UI again.
What would Safari look like? What would Mail look like? Who is going to update the 2.2 million Apps on the store to support it?
This is (would be) a major event that would never be introduced at anything less than WWDC giving developers months to get on board. And even then, this is extreme. This is as extreme as adding a brand new iPhone resolution to the mix, something Apple doesn't do lightly (there hasn't been a new one in 3 years).
Please consider all of these points before dismissing me.
1) I think it would be fairly straightforward for Apple to reskin some of the OS UI and their first party apps with a darker UI. We're not talking major UI changes here at all. Just different colours. You're really overstating the difficulty in this, I think. I'm not saying they could do it overnight - but I don't think there are major stumbling blocks for this kind of work. I have developer experience.
2) Many people would be happy if Dark Mode was only ever applied to OS UI and first party apps. Dark Mode on Mac OS pretty much only applies to a few areas of OS UI.
3) If Apple took the wise decision to open this up to third party apps, it would of course need to be handled by each app's developer, rather than Apple trying to applying it automatically - which would basically be impossible given the variety of apps. Your argument is this is too big an ask for a point update, but a point update can spend a long time in beta if necessary. There's been at least one iOS point update - 7.1 I think - that was in beta for about 4 months, which is longer than the typical 3 months that x.0 betas get over the summer following WWDC.
4) Even when Apple introduces major new APIs at WWDC and gives developers 3 months to implement them, there are a still a LOT of apps that don't update for the final release. Many takes months, years - I have some apps that still don't support the larger screens that have been around for over 2 years now. But here's the thing - Apple nearly always makes old apps compatible with new iOS versions, and it introduces its new APIs in a way which doesn't break older apps. So, it doesn't matter if developers don't update in time for a 10.3 dark mode. Their apps won't be affected by it. Just like old apps on iPhone 5 had borders at the top and bottom. Users will grumble to the devs. Many apps probably won't have updated by 11.0 final, or 11.1... etc. You get the picture. This problem of developers not updating is a completely separate issue, one I think Apple could do more to solve, but it really shouldn't, and doesn't, stop them moving the OS forward.
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So what does Private Browsing look like then if Dark Safari looks like that?
Yes, these are some of the minor problems Apple would have to tackle if they do a Dark Mode, but you really think that's enough of a problem to stop them? Surely your imagination isn't that weak? Perhaps the indication that Private Browsing is active would change, for example an icon in the header? That's just one suggestion. I could think up lots. Apple could think up lots. They wouldn't give up on a Dark Mode because they had to think up new interface ideas.
And...really? That's all you expect out of Dark Mode?
Erm, quite simply... Yes... that's more or less what a lot of people expect from a Dark Mode. Not
exactly like that perhaps, but that general idea, yes. Nothing too special. A darker UI. I don't see why you have a hard time accepting that?