The replace tool is a form of diff (although it's rudimentary), and the read_file tool can be called with line ranges. I do wish robust patching but it is not the "whole" file reading/writing. Maybe you wanted to say about subagent file handling? I can agree then.

(Also I think Gemini is significantly better when it comes to the context rot, in my experience 100K--300K tokens were required for symptoms to appear. So burning tokens is less problematic with Gemini.)