Reasons for filing more than one inter partes review on a single issued patent

Note the article Filing Multiple IPRs for One Patent in Corporate Counsel, which concludes


As a strategic matter, filing multiple IPR petitions may provide a net benefit in terms of attempts at invalidation, flexibility, and perhaps obtaining a preview of the Board's thinking. While filing multiple IPRs might be more expensive, some of the commonalities across the proceedings may ameliorate the cost increase.