Just on that debate of edgers I think Tyler summed it up with his pops experience that all yards are different and some lawns are not edger friendly. Prior to my current medical history I had a privately owned commercial lawn mowing business and 95% of edges were done with the brush cutter purely for the fact that it was quicker and at the end of the day most people weren't obsessed with their grass that if the edge was a bit out it dident matter ( the fact that the edge was done was a plus) the only time a push edger came out was when a lawn edge hadent been done in 20 years and grew 1foot over the concrete that you couldn't find an edge, once the edge was carved the next time would be done with the brush cutter.
I think you will also find in the old days everyone had the old thick Buffalo lawn which was impossible to cut and thatched 4" above the concrete and needed these concrete cutter style blades to maintain the edge. Landscaping back then was also very clean and tidy with very open spaces where as today people want to be different and create caos to stand out and out do the neighbour next door.
I have never used an atom style edger but I can see the benifit in them with all the new fancy swayed edges and driveways, you definately couldn't do a nice edge with a push edger as you would chip half the concrete away hence why Tylers pop went back to his wheel edger.
As wce said what a magic location I'm in, this property and the one next door have been in my family for 53 years and has seen 5 generations and you guessed it it's all square edges and old thick Buffalo. Sometimes simple and clean is easier and better than having a maze of a yard plus who's yard do I have to out do with what's maintenance free beyond my yard.
