Does BI+ behavior vary between models?

My old monitor was a EX2780Q. I was very happy with the BI+ features and had it nearly always on.

My new monitor is a EX2710Q and I hate the BI+. It keeps the monitor always too bright, so I rarely use it and instead manually adjust the light. If I remember right, the old monitor also auto-adjusted the contrast or maybe color temperature depending on what's on the screen. For example, pages with a lot of white would be toned down a bit and were easier to look at. Something that I havent noticed to happen at all in the new monitor.

I expected the BI+ to work pretty much the same in any monitor, with just some smaller differences in performance. But between those 2 monitors, the behavior is entirely different. is that normal?