I've worked with people of varying skill-levels but personally gravitate towards those who can code idiomatically. For me it's important I write idiomatic code and follow the language/framework/api guidelines to the letter so I don't become a maintenance burden to my team.

In the fast-paced world of frontend dev, the last thing I want to do is revisit "complete" work, be it a lack of env parametrisation or something bigger. We make assumptions based on idiomatic implementation - failing to conform means work-items can slip ("This story will slip into the next sprint because the I had to convert the callback into an idiomatic action/reducer first").