I am not spreading wrong information. Maybe you need to learn how solder and TIM works.
You may not see it but, I wrote at same size means same surface area. At same area Solder with high thermal conductivity will perform better than the best TIM, even better than liquide TIM.
And about burning chips, that happen faster with crappy TIM than solder.(And don't give the crappy Xbox soldering(different kind of soldering) problem as example).
And about cost, i5, i7 and i9 are not cheap cpus. They are mid-high to high end cpus. According to intel fanboy intel has best foundary, that means less chip get wested. Also intel's i5 and i7 are samll cpu, which has less chance of being deffective. So how it would cost to intel to solder a cpu? I bet its negligible. Its not like intel is not making any profit.
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I'm going to speak in what might sound condescending, but I'm going to have to make sure the words are clear.
1) The two surfaces that matter are the IHS and processor. The processor produces heat, and the IHS dissipates it to the surrounding environment.
2) TIM could be foregone entirely if the IHS and processor were smoothed infinitely. In effect, the surface area of contact between processor and IHS is increased with TIM. Mathematically, a 10mm^2 processor contacts an IHS in far fewer places than two smooth surfaces, and effectively transfers heat on only a small portion of the surface.
3) Even the best TIM is an insulator compared to metals. It's a trade-off between massively increasing contact area and providing a mild resistance to heat flow. Check those figures again, and you'll see that thermal energy transfer, via conduction, is expressed in surface area and material thickness. (Q/t = k*A*(T2-T1)/d. This means a minor change to d and A (thickness of material and contact area) will quickly outstrip any minor increase in k (the thermal constant). Thus, my recommendation to minimize d and increase A through deformation.
4) You seem to not understand costs. Let's review. The cost to apply a thermal paste is, at most, a precision injector and the material. A couple of cents maybe. Soldering requires flux, solder, heating, cooling, testing, and QC to demonstrate the process is in control. In raw materials the cost may be minor, but Intel manufactures these parts. It's like complaining that a banana costs more than the water and fertilizer required to grow it, despite having to travel thousands of miles and be harvested. The lack of understanding seems to be bridging manufacturing cost with material cost.
5) Why exactly are you bringing up the Xbox? I didn't use it as an example. As a point of discussion it had poor thermal management, and over time the internal stresses from heating and cooling cycles caused issues. It wasn't about poor TIM, but a design flaw of thermal management. The technique of baking the board reseated components, and allowed minor reflow. Replacing the TIM on it was a stop-gap, as you'll note that better thermal management (read: bigger coolers and less heat output) solved the issue in subsequent releases without replacing the TIM. Sometimes poor designs are just poor designs.
6) For the purposes of business, Intel's largest client base, an i3 and i5 is cheap. Allowing you that point for kicks, imagine your $200 processor suddenly costing you $250. TIM allowed for better yields, less scrap, and a cheaper process. Intel didn't exactly pay it back to consumers, but you'd better bet they'd charge a premium, and earn back the same margins. Maybe you'd be willing to pay a 25% upcharge for a processor, heck the k series already asks for 10-20 USD more anyways. I'd gladly pocket the difference and invest in a good aftermarket cooler. Those extra 500 MHz of overclocking aren't worth the problem, as demonstrated by the miniscule percentage of delidding.
7) Buy AMD. It solves your problems. They solder. If your next response is "but AMD isn't leading performance," then go weep in a corner. This is the real world, either speak with your wallet, or stop talking. The way we get Intel to solder is to support AMD. When their sales take a hit they'll listen, until then their profits are large. Why would you invest in expensive and risky things if you're already fat and happy?
Relax dude