Agree. I remember in school in the 1980s reading that a good programmer can write about 10 lines of code a day (citing The Mythical Man-Month) and I thought "that's ridiculous, I can write hundreds of lines a day" but didn't understand that's including all the time understanding requirements, thinking about design, testing, debugging, etc. Writing the code is a small portion of what a software engineer does.

Also remember that programs were much smaller, code had to be typed in full and read accurately because compilers were slow and you didn't want to waste time for a syntax error. Anyway it's common even today to work half a day thinking, debugging, testing and eventually git diff shows only two changed lines.