I never got the sense that LE was intended to cater to GUI crowd in the near term. Its intended to be automated with tools you build yourself. It’s not really fair to suggest that LE do not have their shit together, when a GUI was never their goal.
Anyway, there is this project that might be what you are looking for (a web client for LE)
you can search for ‘gethttpsforfree’ here on the forums to get more info about it or contact @diafygi who is the developer.
Hope this helps.
Also, there are TONS of LE client projects out there that would be easy to build a GUI app from: