ok, if you can build one codebase with reactivity to cope with small mobile screen up to 4k, i can sketch out the general spec of how the design will be on the 3 different sizes. i have already done a lot of work with this.

desktop apps that can shrink to mobile widths especially are handy when you have a dynamic tiling window manager, lets you stack little displays for apps that you want to watch but don't want big detail unless you want big detail