Accurate color looks dull to most people, and is nothing like the typical cell phone screen is calibrated to. I work on a professionally calibrated monitor every day, and the OLED screens on phones are sometimes hard for me to look at for long periods because they are just so over the top. sRGB (which is nothing more than a color space) mode on the 6P makes the colors MUCH more accurate, but to most people it will look dull, especially if you have just been staring at your phone for a while without it enabled. If you do try it out, I encourage you to use it for more than a few seconds, you will get used to it and may actually prefer it. Most people seem to like the super bright, punchy, over-saturated look though which is totally fine too. If you're a really heavy user, you'll find sRBG mode is much easier on the eyes.
Same thing when you go look at TV in a store - they have them on "display" mode which usually means brightness and contrast at 100%, and saturation jacked up with all image enhancement features enabled. I personally think this looks like trash, but people are drawn to it because it's bright and colorful. A properly calibrated, accurate display looks unimpressive to some people at first glance, but it's all personal preference at the end of the day. If you like eye-scorching color and contrast, with crushed blacks & whites and zero detail in the shadows, you will be a fan of how TV's are set up in the store haha.
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