Why would you say it has been getting worse?
Their development priorities are all wrong. They keep introducing pointless things, like widgets that appear by default on the lock screen. As far as I'm concerned, locking my phone means nobody should be able to do
anything with it (by default). If I configure widgets to be usable in that state, that's my business.
They also keep moving things around and changing the basic ways to accomplish the same thing. Like, there's now no silent mode (unless you count turning the ring volume all the way down), but you can turn notifications off, which is the same thing with a different name. In the particular case of the OnePlus 2, they introduced a hardware button for that, so none of the guides you find by Googling on how to turn off notifications work since there isn't a software switch. It took me months after obtaining this phone to even work out that's what the hardware switch is for, since Android had successfully trained me to expect everything to be in software.
I wouldn't be so salty about them introducing new pointless features if they were actually introducing features I cared about -- like, say, the ability to trust a package manager that isn't Google Play, so you can install third-party software without having to approve each individual package. Or the ability to have gapless playback just work through the Android audio API, rather than that being a "feature" individual music players need to implement themselves.
None of the things that have bothered me about Android from the beginning are getting any attention, and meanwhile all the basic things I do every day and shouldn't have to think about are changing with each new release. It's an absolute nightmare.
Finally, all this new code they're writing for no good reason is full of security vulnerabilities. Android is well known as a lump of Swiss cheese you carry around in your pocket. Rather than doing what most projects do and leaving security bugs fixed, they keep renewing their codebase and creating more. I simply don't trust my phone not to get hacked anymore.
The dual SIM comes in handy when you make consistent use of two numbers.
I'm expecting it to be useful when travelling internationally, even when using more than two numbers. I can swap SIM cards at the hotel and have my phone work throughout the day's journey. No more fumbling around with SIM cards at airports when I need to contact someone.