Oh please, 100GB? No. macOS requires about 10-15GB for a fresh installation. Also, the whole point of the unified OS means that Apple will install only the Macintosh components on a Mac, and the mobile components on an iPhone/iPad/etc. Windows 10 does pretty much the same thing... I believe it's called a modular installation.
Also, nothing is truly impossible.
man many people will love what you said about windows 10 to be true but many old school users hate the fact that Microsoft merge the OS after the last true windows which was windows 7, the nightmare started from windows 8 upward, it is a tablet or a PC , I always like the idea , one OS for desktop PC'S and Laptops, another OS for tablets etc ,but they put unnecessary components and processes on a windows desktop, who needs all those tablet services on a desktop pc , at least give the user the option to remove tablet mode, a desktop pc don't need it, this is why I like apple, iOS for iPads, iPhones etc and Mac OS for Macs, I really hate windows bloatware. the way it used to be was perfectly fine.
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Still no RAID support...
Or at least let us keep using the old file system for High Sierra....
Still can’t upgrade my Mac mini server because of Raid 1....
you can use raid on High Sierra but only in HFS+ file system, but there is another problem , the preboot partition, HS updates need to access that partition in order to install the update, so if you don't have that partition the update will fail, so you need another drive, a single drive non raid running High Sierra to install the update there, then clone that drive to the raid after you finished installing the update, yeah I know it sounds like too much trouble, I didn't have to do that in Sierra. I been a raid user on Mac OS up to High Sierra, when apple forced me to give up on raid, at least on bootable volume, what I do now if I need some extra speed, I use iram disk, also even if you have a Samsung 960 that app will help you not to wear out you Samsung drive if you do a lot of writing, I do all the heavy writing with iram disk so I can keep my Samsung 960 healthy so it can last longer