Debate: Do Single Product PLA Ad Groups Strangle ROI?

Building out Product Listing Ad campaigns in Google AdWords with single product or single SKU ad groups has become a fairly common practice. The idea being that isolating each product into its own ad group gives advertisers more control over which item gets served for a given query and enables faster product-level performance analysis and more granular bidding strategies.

Source:http://searchengineland.com/do-single-product-pla-ad-groups-actually-strangle-roi-173849