MacOS Sierra runs fine on my Early 2011 17" MacBook Pro with an SSD. Have yet to try High Sierra on that hardware.
As for third-party developers cutting off MacOS Sierra well before High Sierra, I'm doubtful that will happen in too many cases. More likely the two will be grouped together, as Lion and Mountain Lion were for many (but not all) apps that no longer support either one.
Edit: Concerning HEVC support, since it is a standard codec and not Apple proprietary, third-party software such as VLC should be able to play it fine on Sierra, though it might not be able to play in Quicktime Player or iMovie (I have not checked specifically).
The update is much more compelling for newer hardware than it is for older hardware. I'm considering downgrading my 2012 Retina MacBook Pro to Sierra because the performance is slightly worse now on High Sierra, but have no reason to do the same on my primary 5K iMac. My iPhone is still on iOS 10, but admittedly I'm probably in the minority there.APFS
HEVC <-- This is essential if you have a recent iPhone and want to save space
HEIF <-- This is essential if you have a recent iPhone and want to save space
Photos 3.0
Metal 2 (although this does not apply to 2011 Macs)
etc.
This is one of the most important OS upgrades in years, and it runs fine as long as you have 8 GB RAM and SSD. It even runs OK on 4 GB RAM and SSD.
The format support alone is worth it, because no OS before High Sierra can natively understand HEVC or HEIF/HEIC. Now, a 2011 MacBook Pro isn't going to be able to play 4K HEVC of any sort well, but it will be able to play 1080p HEVC just fine, and HEIF Live Photos too, and of course it will be able do display HEIF still photos. None of this natively possible on any version of macOS prior to High Sierra, yet these formats are the norm now with some iOS 11 iPhones.
Safari 11 gets some nice upgrades as well, although I believe both Sierra and El Capitan get those benefits too, since they can also run Safari 11. Auto-play blocking is a great feature.
I currently have 5 machines on High Sierra. For two of those machines they only support up to El Capitan officially so I never bothered with trying to get Sierra on them. But once High Sierra was available, I jumped at the chance of getting High Sierra installed on them. For my other three machines, High Sierra is officially supported. One of them is my main desktop, and the machine on which I sync all of my iDevices. Normally I wait a few point updates before upgrading to a new OS, but I upgraded that machine right away because I knew my software worked in High Sierra and because I need to be able to understand all the media files coming out of my iPhone 7 Plus, which in iOS 11 are HEVC and HEIF based. One of the other machines is my main laptop, and I upgraded that one back in the betas for High Sierra. For my third supported machine, it only has a hard drive, but I upgraded that one to High Sierra with APFS too.
One user-facing feature of APFS that I really like is the instant file copy. If you copy say a 5 GB file to another spot, the copy will be instantaneous, and the total combined size of the two 5 GB files together is still just 5 GB, because it doesn't actually make a copy. It just points to the data in the new location. Plus APFS is supposedly better designed to maintain data integrity, but that's not actually something that's directly visible to the user. Another advantage is native and more fine grained encryption, but I don't use encryption so that doesn't apply to me.
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Put it this way: I suspect going forward, macOS 10.13 is going to be a hard cutoff for a lot of software and even hardware compatibility, because the iPhone 7 together with iOS 11 have started the process of making everything before High Sierra obsolete.
As for third-party developers cutting off MacOS Sierra well before High Sierra, I'm doubtful that will happen in too many cases. More likely the two will be grouped together, as Lion and Mountain Lion were for many (but not all) apps that no longer support either one.
Edit: Concerning HEVC support, since it is a standard codec and not Apple proprietary, third-party software such as VLC should be able to play it fine on Sierra, though it might not be able to play in Quicktime Player or iMovie (I have not checked specifically).
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