I had to laugh when I read the above.
Now, before I go any further, I totally get that this level of sophistication is not needed for 1 mile shooting. The only reason I'm responding here is to dispel some of the statements being presented as "facts."
If you're not interested in that, skip to the next post.
I'm not sure what we don't like externally adjustable; I have seen some pretty kludgy setups to get to longer distances and I appreciate a simple, all in one solution. No huge rings built on top of think rails. No prism in front of the objective, etc. Also, by having external adjustments, the IQ through the riflescope is always at maximum.
The Genesis riflescopes also come with an add-on elevation insert if you need one for your application. No need to buy anything else.
I believe Dusty made up his mind about March scopes 14-15 years ago, in the early days, as he stated, and he never looked at another one ever again yet feels qualified to make general statements about them. This is about his statement that they "are always darker".
Yes, they are quite well established in F-Class, and it's not because they "are always darker" than other scopes. I also take advantage of the resistance (not invulnerability) to mirage distortion afforded by their Super ED glass.