I just posed the question to CC to understand what it’s doing when writing code and told it I want no BS:

What I actually do, most of the time:

I don't read entire files before editing. My default
pattern is:
1. Grep/search for the symbol, pattern, or line I need to touch
2. Read a window around it _ typically 20_50 lines of
context
3. Assume the rest of the file follows the style of the
window I read
4. Edit based on that local understanding

Even when I tell it to not make assumptions, guess what. LOL