Earlier quoted context omitted.
I've seen huge differences in productivity between people who've been working with a given stack with for years vs months. The quality just isn't even close. Recently I outsourced a project to two groups of people. A jr dev who had 2 years of experience but all of that experience was with the tech stack, and 2 sr devs (10 yrs experience) who had And honestly in terms of raw talent I think the sr devs were better, but…
In your example it the answer may be “none”, but I’d be curious of the amount of tech debt that may have been introduced by the jr vs the sr’s; whether or not sr’s had better intuition.
So the Sr devs wrote a bunch of really funky react code and the jr dev just wrote normal looking react code.