You be the judge.
Of course the back of the neck is not visible when it's played. I think the clean line between the sanded and the original finishes looks good (achieved by sticking some insulating tape on the neck before sanding) - and the front of the guitar has a brushed finish anyway. I'm not bothered about any problems this might cause if when reselling as these guitars are keepers - and anyone buying it would only be impressed by their playability.
This is the YouTube video that was the main source for the work - https://www.youtube.com/watch?v=vOfbLcWcarY&t=114s. I did this first on a Squire Tele and was knocked out by the improvement. It's no exaggeration to say it took about ten minutes to do and the difference was immediately noticeable. I also made a few final passes with talc on the 1500 grit sandpaper which was recommended by someone, somewhere.