The fact you have to have a removable back is a completely arbitrary requirement. Pretty much everything else could be addressed. Several manufacturers do at least some of those requirements, there might be one or two that does all. As far as signing up for Google, that's not a magical pill that makes your identity complex - it's already there. Don't think that having a Microsoft account is somehow safer or less complex. What hoops does a Nexus device require to buy? Clicking a button on their website?
You use Windows, that's great. I'm not looking to change your mind, just address some of the misnomers.
The biggest issue to this point is the quality of the camera - it's been the one missing piece. However the new Nexus seems to be pretty good, the Galaxies have been good, and LG seems to have gotten it right as well.
I mean, I'll make this my last reply because this isn't the thread to do this in the first place, and I'm sure there's SOMEONE considering complaining to a mod.
Everything is arbitrary, in the end. The pink iPhone's popularity is based on preference. The customization ability of Android is arbitrary. One preference doesn't negate the other. It matters to me because I've sat with a black slab for the past 5 years, and I'd like the option to swap the back for something more vibrant. That, and it means that if the battery gives out, you don't have to send the phone off for repair, or risk making matters worse if you screw things up opening a unibody device.
As for the account thing, it's about consolidating things. I already have a Microsoft account for Xbox LIVE. It's not about if Google's secure, it's about having to create an account I don't need. The hoops to jump through, they're not major. They involve doing the one-payment device purchase, which sucks when your disposable income doesn't allow it quite yet (as I've previously stated, I just started working and getting paid, so I haven't gotten to save up enough to start making big purchases on a whim, though this isn't a fault of Google, and it would apply if I went for a Lumia 950XL). What kind of matters is having to wait on the shipping to get you the phone. I'm impatient, in some respects.
I would have to grab my little brother or dad's phone to check the camera on a new Samsung device. I haven't tried one since the S III, and it was crap. Low-light performance was trash, and the colors were WAY too saturated for my liking. But even beyond that, going with a Nexus device also means giving up wireless charging and microSD support. I have 32 GB in my 920, and it's not enough anymore for music, photos, and videos. I hate having to curate my media content on my phone (my music library's about 50 GB, and I have probably north of 1,000 photos and videos). And seriously, it sounds dumb, but the camera button really does make a difference to me. It makes photos faster to take, and it's gotten me more-willing to take pictures.
Android is a better operating system for anyone that wants diversity and options, and that's what I'm looking for.
Oh, yeah, no doubt. Like I said though, I'm fine letting the people in my family incapable of understanding electricity use iOS. Saves me 12 headaches/month, I'm sure.