EA Bias-
I'm in a similar situation around the house, but with 3 Win 7 Ultimate machines, an XP Corporate Machine, and a 36TB WinHomeServer 2011 media server in the basement.

I don't love MS, it's just what works for my needs.
Now, on to phones:
1. You're right. Realistically, who won that? Remember the best selling product on Apple OS, It's Microsoft Office, and has been for nearly 20 years.
2.A new phone does come out weekly. Which is a *good* thing. It provides pricepoints and products that a company like Apple refuses to hit. So the kid down the street with a paper route, and the doctor can all afford to jump in to the fray.
3. Correct. Both can enhance/detract from a user's experience. And you can choose between what's important to you. I "get" why people choose iPhones; iOS is polished, finished, and relatively smooth. Early Androids weren't, current ones are. iPhones didn't start polished or smooth either. Remember sending MMSs? Or the amazing new cut & paste technology in iOS 4, that I had on my Blackberry since '03?
4. Fragmentation only exists on TiPB and in Apple PR; over 99% of the Apps run on any Android 2.2 or better phone or tablet. It's about the same percentage that require the A4 or better (iPhone 4) processor. It's not an issue. It could have become one, or could potentially become one in the future, but it isn't now.
5. You are correct. Updates are manufacturer and carrier driven. I've owned three Droids, and an iPhone 4. I've gotten regular updates to each model, my most recent on the Bionic last week. If you buy an old phone, yeah, it'll be orphaned. Much like if I bought a 3GS now, I wouldn't expect longevity.
6. 4G CDMA/LTE is relatively mature. HSPA isn't.
I personally think it's a load of poop designed to cover themselves for not getting their radio technology squared away in early prototyping; you can't in one breath claim to be an innovator, then tell people we adopt a wait and see approach in the second breath.
LTE does consume power. It's true. It's the major drawback to any LTE device. But, with an out of the box setup, I can run all day, with conference calls, push e-mail, GOOD encryption, and piles of data use, with a dual-core processor (they throttle based on load) with 20% left when I go to sleep. Plus, if that's not enough for a given day, or if I'm travelling I can swap my battery for an extended-life one. Can't do that with an Apple product.
And I get good LTE coverage in East Amherst; I'm on it right now. We'd have more if we didn't have to wait for Canada to turn off analog TV service.
7. You're correct. Open source has it's advantages, and disadvantages. It's funny, tho, with 3 Androids, and a Galaxy Tablet, I've never stumbled across Malware. If we're talking jailbreaking, I can root and install a custom ROM. Let's keep things Apples to Androids here, so to speak.
And to give you an idea how rough that walled garden can be, a good friend is a developer (Both major mobile platforms.) His software was rejected due to "language." When he asked what the issue was, his instructions stated you could share data across platforms, which contained the word "Android." Needless to say, he wasn't enthused.
I'm not anti-iOS. It works. It's not a bad platform. But, the software isn't that much better than Android anymore. And that advantage is slipping rapidly. Both have their own set of issues. The most stable/secure is actually BlackBerry, but it's boring as heck. and stuck in '05 with Symbian.
The question for me was, if I had to choose one phone for the Cap'n, what would it be? That, for now, would be either a Nexus S or a Bionic (Haven't played with a Nexus, but I may ask for one after the holidays...) The iPhone 4 was a stunning piece of sculpture in it's day, with a deficient hardware set. The 4s (in my opinion) looks tired nearly 18 months later.
Trust me, as a telecom guy (and resident geek) they're both full of holes, pick whichever suits your needs/wants. I just offered a differing opinion.