Parmandur
Book-Friend, he/him
It's a bit of a closed loop though, isn't it?
If you want a setting book on FR you really have nothing else to buy this edition do you?
I don't think it would be a stretch to say that SCAG is one of the least well received 5th edition releases. I mean, how many more books of this format did we get? If it was such a success where are the rest of the books like this?
The Adventure books which zoom in on particular areas are the rest of the books like this.
There are several Adventures which have lower review scores on Amazon, and are not selling as well. I don't think anyone will say it is their favorite 5E book, but it has done it's job.