But if I don't want 8.1, why would i want W10?
What do you think you're losing out on if you choose to upgrade to 8.1? The social integration changed because Microsoft couldn't continue to hold the platform and the integrated social services to ransom by hardcoding it all into the OS. So they changed the integration model such that the app rather than the OS handles the integration allowing for faster innovation. So at first when 8.1 was released, it broke the existing integration but as those apps have updated over time, pretty much everything except universal chat is back. As an aside, I use a very light-weight app called Multishare and it puts back the same multi-posting feature from 8.0 and more. Check it out.
There are many benefits to upgrading to 8.1, your mileage with any of them will obviously vary. I actually find that the separation of the volume levels, whilst a small thing as you said, has a big impact on daily use. I didn't think that I would make much use of the Notification Center but boy was I wrong. I can't be without it. The quick access to things like turning off Wifi or setting brightness level or turning on Tethering is an invaluable timesaver. 8.1 introduced Quiet hours which again, I never thought I would make much use of it but is very useful and takes care of silencing my phone during meetings (automatically looks for free/busy in your calendar) and at set times at night. There are so many little things, some subtle, others more pronounced.
I like the way that the Folders on Start screen works. Rather than a static folder holding app icons as I expected (and ala IOS/Android), instead, it works in harmony with your live tiles and your live tile sizes, allowing you to make better use of your screen space and organise things. Before 8.1, I used to have a single tile for my linked Inboxes that I only casually looked at from various secondary email accounts that I have. Now with folders, I pin each linked inbox as a tile and then put them all in a folder so when I tap the folder, they all fly out and I can, at a glance, see what's new across all my linked inboxes rather than a single tile which aggregated everything. But it goes further than that--I have several email aliases tied to one Microsoft account and now I have a live tile for each alias - as if it were its own mailbox and each is pinned inside the folder. That one step makes me much more productive and I'm on top of all my email.
Wow, I could on and on. Like I said, your mileage will vary with all these things but it's the benefit of the whole rather than picking at one feature that's unlikely to change the world on its own. Ok, one more feature I love is reading mode - it's one of the nicest features of the new browser (IE 11) in 8.1 which redraws webpages to make it easier to read more like a book. Whilst we're talking about IE, there's InPrivate browsing, you can sync your Favourites, passwords, history, wow so much to like. Don't let social integration hold you back.