It's quite an indictment of the current state of our tooling (not just tmux) that such an application as this is necessary. Why isn't it easy to configure this in tmux itself, and persist the resulting configuration?
My use case for building Cockpit was to easily generate scripts for my different layouts. These scripts I use with
https://github.com/fitztrev/shuttle so I could load my workspace with a single click.
I am not sure if this application is necessary. However, I think everyone can find their own use cases.
I wonder if there is some sort of inverse relationship between having comprehensive features, thereby being self-contained (think Smalltalk), versus having a continuous dialog with the imperfect outside environment (think perl). I'm sure this is implicit in the famous "Worse is Better" essay, if not explicit.
I mean: the author of tmux could have bundled the package with a comprehensive environment. But what really is there, beyond Unix and the browser? If it exists, people haven't heard if it, and even if they had, would just as soon reinvent it. At any rate, the inevitable imperfections and inpedance-mismatch with users' existing workflow / UI would surely invite brutal criticism. (For example, when Plan 9 came up here a few years back, a big chunk of the discussion was about how ugly the GUI seemed to them!)
I highly recommend https://github.com/tmuxinator/tmuxinator if you haven't tried it, I've actually used it to run whole microservice environments locally and works without a hitch
The defaults are a little funky but they’re easy enough to change. I have mine so prefix+s splits horizontally and prefix+v splits vertically. And then prefix+(H,J,K,L) resizes.