Using CPU/Heatsink without thermal material

I finally got the chance to remove thermal paste sitting between CPU/Heatsink while replacing my mainboard.
The purpose of this is to have the best heat transfer between CPU/Heatsink. According to my mainboard manual, thermal material
for the CPU/Heatsink is not a must. My opinion is unless both the surfaces of CPU/Heatsink are poorly engineered and require thermal material
to fill the gaps. The result is a success. I had upload some images that include removing of thermal paste from CPU/Heatsink and CPU temperature readings while playing. Kindly share your opinions and experiences on this.