"Should we adopt MMM (Marketing Mix Modeling) too?" "Do we need incrementality measurement at ¥50M monthly revenue?" Since the start of 2026, EC operators have been asking these questions in rapid succession. LinkedIn, X, and overseas SaaS vendor blogs are full of headlines like "2026 is the year of MMM revival," "AI changes measurement," and "Full Cookieless transition." Many SMB EC operators do not know where to start. The short answer: the 2026 EC measurement landscape has 5 trends, but SMB ECs do not need to chase all of them. I designed RevenueScope for SMB EC operators in Japan (¥10-50M monthly revenue), and after a year of conversations with operators about what trends actually move their P&L, my honest take is that 4 of the 5 trends are premature for sub-¥1B businesses. TL;DR The 2026 EC measurement landscape has 5 trends (MMM, Incrementality, AI in analytics, Profit-centric KPIs, Cookieless). Only ¥1B+ enterprises should pursue all 5. SMB ECs narrow to 1-2 by revenue range.…