Agreed. As Simon Willison points out, November 2025 was a a critical months because that's pretty much when coding agents became «good enough», eliminating most of the problems pointed out in this study.
I regularly see Claude Opus 4.7 dropping constraints from an otherwise small CLAUDE.md at merely 20% context use. I have to keep reminding it, and it has all info ready in its context, still time to time decides to ignore parts.