First, I disagree that it's a really good device out of the box. I think it is mediocre at best, for all the reasons I listed. In fact, I dislike it so much, I actually went back to the iPhone 5s (provided by my employer) that I was previously using. But I don't think rooting would fix very much of that, so that's why I said I was overlooking it. But as long as phones (esp carrier-locked ones) don't come with ad-blocking and wireless tether out of the box, there will ALWAYS be a reasonn to root, MO.
He actually went as far as to say (paraphrasing): 'I can't think of any improvements that need to be made to this phone.' Well, I just listed several. That was the entire point of this thread.
No, you actually listed several that you would want but that don't see to be major issues, at least for most. For example, most of us appear to really like the clock showing up with Active Display and wouldn't want to disable it. That seems like a pretty minor issue, at least to me, to make your "major issue". And it is funny, at least to me, that you "dislike it so much" that you went back to a phone that you can't see the notifications, at all, without picking up the phone and pushing a button. But maybe that's just me? I can agree that that Active Display can sometimes be too sensitive but I'm one it doesn't bother -- I'd rather have it too sensitive than not sensitive enough.
I can agree that it would be nice to be able to turn on DND manually. OTOH, it is fairly easy to turn it on using your calendar; just schedule yourself a nap; and this gives the advantage that you don't have to remember to manually turn DND off. I'm guessing that they don't include auto-respond with text, for your nightly sleep time, because they assume that people will know you are sleeping. Again, it would be easy to work around by making your nightly sleep a scheduled "meeting" on your calendar, and that would give you the ability to send a text. Additionally, you can set it up as a recurring meeting, with different times for weekdays and weekends. To me, Assist is far ahead of anything I've seen on other phones. That isn't to say that it couldn't be improved by something like a manual toggle, but it is quite good now and easy to work around your concerns.
As for Bluetooth in your car, unfortunately it sounds as if your car's Bluetooth and the Moto X have some type of issue. As others have stated, they don't have this issue. Unfortunately, this is a Bluetooth issue that exists when trying to pair certain phones with certain cars and that no manufacturer has been able to fix.
As for rooting the phone; I find it hard to be upset at the difficulty in rooting my phone when I could have bought a Developer Edition, that was made to be rooted. As for tethering, my Moto X came with it, out of the box; though I do have the unlocked version. I'm curious is this is an issue with your model of the Moto X; which likely makes it a carrier issue (your carrier did not want tethering available on their version), and not a fault of Motorola's.
I'm sorry the Moto X wasn't for you. To me, one of the best parts of Android is the choice; you aren't forced into a phone that doesn't work the way you want it to. I hope you find the "perfect" phone for you. For me, I choose the Moto X.