PC Perspective published a review on the Ryzen 7 2700X and Ryzen 5 2600X processors
A quote from the article:
Despite what might be considered an overall slump in enthusiast PC building due to record low GPU availability and sky-high memory prices, 2017 was one of the most exciting and competitive years in recent history when it comes to CPU innovation. On the desktop side alone, we saw the launch of AMD's new Zen CPU architecture with the Ryzen 1000 series of parts starting last March; we also saw new HEDT platforms from both Intel and AMD, and Intel's first 6-core mainstream CPUs.The Ryzen 7 2700X and Ryzen 5 2600X Review: Zen Matures
Although the timeline doesn't quite work out for Ryzen to have affected the engineering-side of Intel's decision to release a 6-core desktop processor, it's evident AMD's pressure changed Intel's pricing and release schedule.