People I've worked with that used R and manged data / did analysis didn't really seem too concerned with long term maintenance.
Secondary observation, these same people were the first to preach for the AI coding gospel.
Unless you’re the poor schmuck who is given the task of running the code written by the previous analyst, who has probably already left the company. Often it’s easier to just throw something together from scratch and then look for a new job, perpetuating the problem.
Two things that make me wonder if they can possibly turn out good quality R.
Perhaps a true test of AGI will be when you ask it to write an application in R and it refuses for fear of what people might think.