Yes it adds value to see an interface, funny you should mention that specifically because recently I was on the job market and I created a Hugo blog where each job I applied for was one post. So I could keep track of when I applied, how, interviews, results and so forth in one markdown file. Then when it was time to report my job applications to the government so I would get money I just ran hugo server and looked at them graphically and chronologically.

I'm guessing the main advantage is navigational structure - while I agree that can be overdone, and I practice very minimal navigation on my own 'blog', I think some amount can make the pile of markdown files easier to read.