I don't care about backup as yes it's all getting sucked onto a cloud somewhere. I have 6.5 btw and myPhone just got cutoff this month for us old schoolers.
Meh, Sony's proprietary memory stick can be read by everyone. An open standard SD Card formatted by WP7 can't. Tomatos/Tomatoes in a half full or half empty glass.
When people and their friends and co-workers each have phones, tablets, laptops and PCs people need versatility to share data. MS just cut themselves off at the kneecaps by looking at the device as just that device. People want integration amongst their devices not segregation.
Your points about CS are completely valid but that's a benefit to MS not really the consumer. I'm sure they've got tons of calls already from customers wondering why their cards are not compatible or why all their data got erased.
Even a $25 Sansa Clip+ comes w/ 2GB of integrated storage. I can't imagine WP7 needing even that much and it driving up the cost of each unit beyond the threshold consumers would purchase. But yes your right, MS is controlling the device via software and hardware in a way that limits the freedom of the end user. One reason I said MS is following the 'Apple model'. The benefit is a slick, smooth UI and experience for the average consumer who can't even implement more than 20-30% of their device's capabilities. The rest of us want more options, versatility and user control. That's why I will never use WP7 (w/o changes).
If MS wants to be Apple why wouldn't I just buy an iDevice? Apple has greater marketshare, penetration and a massive app base.
We'll see what happens w/ WP8 and Windows 8 since that is where this is all leading for MS. I'm already worried I'll be jumping the Windows ship. I really think MS is putting itself in a position where people will have to pick the lesser of two evils. IMO they are playing right into Apple's hands.
All I got for ya and MS atm.