Comment by Fluorescence

Scale ruins everything but that's where you will find "very senior devs".

> Sometimes it is.

What's the worst case of the other times? These "one hour" estimates are the golden path, nothing goes wrong, minimum. It's not the average of horror shows or an amortisation all the related support work required to sustain efficient development over time. They are often too coding-focused and ignore the level of interpersonal work to agree and sign off features or to change code in collaboration with others. Talking through a demo can take more time than the code.