Performance: server rendering, image optimization, and edge caching are framework features, not plugin promises. Real-world WordPress sites we migrate typically go from 4–6 second loads to under 1.5 seconds — which compounds into rankings and conversion.
Security and maintenance: no plugin update treadmill, no PHP exploit of the week. A Next.js site on Vercel has a dramatically smaller attack surface and no maintenance contract burning €100–300 every month.
Cost of ownership: WordPress looks cheaper up front and gets expensive quietly — maintenance retainers, plugin licenses, performance fixes, the eventual rebuild. Over three years, a €12K Next.js build frequently beats a €4K WordPress build on total spend.