1. magsafe: objectively better
2. longer battery life: objectively better
3. same performance at much lower cost: objectively better
4. no need for dongles: objectively better
You can always take things out of context or present them in deceptive way and claim that it's objective, but you made several logical fallacies here.
1. Looking at things in a vacuum, you can claim a lot of things, but you fail to mention advantages of USB-C charging. It's not objectively better if I want to charge my MacBook with one cable from my monitor, for example. Or if I want to choose which side I plug the cable in. Sure, in some other cases a magsafe could be better - but in the end only thing you can claim with certainty is: it depends.
2. Longer battery life is objectively better - yes - but that's assuming the older model gets longer battery life.
3. Even more pronounced here -
A) same performance at much lower cost IS better, but you fail to take a lot of things into account. First of all, the performance is not the same, across all the models, the GPU performance is better and SSD performance is better and memory is faster. Also, reports say that CPUs throttle less, as I mentioned, resulting in better performance.
B) Also, you fail to take into account smaller volume - even if the performance was the same, the smaller volume for same performance is an achievement and some people will appreciate a lighter laptop.
C) You are only looking at performance to cost ratio - but the cost is higher because of other things. I'm not saying the much better screen, smaller weight, better speakers and larger trackpad (and Touch Bar on TB models) is worth it the differenc for everyone, but it certainly is a good value to some and certainly doesn't make things so simple.
4. Again, you look at things in a vacuum. Yes, dongles is worse than no dongles, but
A) You can avoid more dongles with new cables
B) While the dongles are not an advantage in themselves, the ability to use the ports (with dongles) to connect practicaly everything is better than having a few specialized ports
Also, in general, you fail to take into account all the benefits of the new model, that one might consider objective:
1. Brighter screen with better colors is objectively better
2. Lighter laptop is objectively better
3. USB-C is objectively better for upcoming USB-C devices. You can use old devices on USB-C, but you cannot use new devices on previous ports, which is objectively better.
4. Better build, especially the hinge, better speakers, etc. - objectively better
The fact that you chose only specific (and questionable, to say the least) points shows that, in fact, the point you were trying to make was not objective, but quite subjective in fact.
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Display: Honestly it's nothing to get excited about, it's about as 'retina' as the 2015 model, it does have stronger colours and higher brightness but certainly isn't a buying choice.
Well, that really depends what you appreciate, but let me tell you the brighter screen and better colors is a major factor for me and one of the more important reasons why I just love the new MBP.