Here 6000/6500K is the most common everywhere - Homes, businesses, etc. Seems that outdoor lighting is the biggest exception, there the most common is 4000
It does make sense that for people who generally prefer the 6000K-colors, to give them some fine tuning option around that spot, and not far off color options which they won't use. If you want 3000/4000K you'll just get the other tube with the other set of colors
Personally for me :
I use 6500K Halophosphor Fluorescents throughout my workshop and they are great, even when i am there for very extended periods
At the same time i think LEDs of any color temp are plain unfit for purpose (all of them by awful spectrum, >3000K additionally by amount of blue light, and <3000K by color temperature)
The extreme edges of available LED colors ("white" temperatures) - <2000K and >7000K are a bit of special cases :
6000K is a pretend white light. It is white enough in appearance to make us think it is normal light, while in reality it is anything but. Blue light aside, it lacks the central band of spectrum that we are the most sensitive to - Green. My understanding is that looking at things under the light, some things will appear off, and our vision intuitively will feel stuck, unable to figure out why nothing looks right, despite it being white and apparently all colors are there. This may not be too critical in some applications, but probably not good long term in most places
7000K is so far off the scale that the vision easily writes off everything it misunderstands to the lighting and isn't bothered with it. The only problem with it is then the blue light
2000K is "not white" enough that we don't put high expectations for color rendering with it either, and in 2000K the amount of blue light is low. This may actually be one LED color with no significant drawbacks, except it is not appropriate for a lot of places
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