That the E is built better is arguable, at best, unless you're speaking simply in terms of design. The two reels are built equally as well as one another. That the G was toned down to give the CHronarch the spotlight is completely incorrect. It's not a sales theory, it's fact, and it's a direct result of the exchange rate.
The Curado was never, ever intended to be a $179 reel, it just wasn't. The only reason it stayed there is that Shimano had agreements in place, and didn't have to raise the price to the $199 mark that it should have been for the past five years. For years, dealers and consumers have been screaming for a quality reel, like the Curado, to be at that mid range price point, like the Curado used to be.
The G series of reels really gets back to the state that the Curado should be., the Chronarch E series gets back, again, to what it always has been. It's not a matter of one stealing any spotlight, or shining brighter. That's a laughable assumption at best. It's purely that Shimano was faced with killing off the Curado or Chronarch in current form, and letting one of the best, most bullet-proof reel designs ever go to waste, or adjust the lines of reels and get back to business.
For the record, there's no issue with quality of the reels, don't let the internet hype fool you. The Malaysian factory has higher tolerances and is filled with Japanese engineers and QC, the reels coming from the factory are every bit as high quality as the Japanese factory produces. It's that simple.