It's nice to use, but awkward because almost nobody has a three-button mouse laying around. One of the cool things about the Blue Book is that it lays out exactly how to implement e.g. graphics primitives and even the object system itself. In fact, the implementation I linked above uses the exact implementation of these things as outlined in the Blue Book, just written in Java.
> The first thing is that the Smalltalk environment wasn't really an operating system the same way something like Mac OS was. It’s more like an IDE that runs on bare hardware.
I disagree with this. It is an operating system. Just because it doesn't have barriers like a kernel and doesn't treat debuggers as third-class citizens doesn't make it any less of an operating system. It just makes it "not Unix". Lisp machines were also very similar in this regard: there is no "system" in the Unix sense: your compiler, debugger, and runtime were a whole unit and that is what you booted into.
> The Smalltalk environment was a revolutionary GUI, but it was still a system you would have had to have been a computer operator or something to really use.
Probably true. But I'd also like to mention the images in the GitHub link I posted are very early snapshots of Smalltalk-80 and may lack any features that were added later. More importantly, the author is missing that these machines came with a manual that likely described how to use the interface. But I do have have to concede: these machines were extremely expensive and definitely not targetted towards "everyday people", but can we even say the same about the Lisa? I know the Macintosh was definitely designed for everyday people, but the Lisa was pretty expensive even for its time, and many attribute its commercial failure to this.