If they don't have it, but are promising it soon, then there was no design decision not to include it. It means it wasn't something they could develop in time for shipping. As those who posted to FR in the early days of the iPhone can attest, smart linking has absolutely no use whatsoever in posting.
What limitations do you find in not having unlimited multi tasking
I understand the reason for not having unlimited multitasking. But now that even Apple has allowed controlled multitasking (allowing some level of multitasking without killing the battery), Microsoft is coming out with an OS that doesn't even have that. IOW, lack of full multitasking makes it inferior to those who like Android because it does allow that, but those who prefer the battery savings also have no reason to go to WP7 because Apple still has something better.