I don't know exactly what problem they solve, but for example, my PIT project is 150kb in size and works everywhere. My friend ran it on "zsh with powerlevel10k

I don't know exactly what problem they solve, but for example, my PIT project is 150kb in size and works everywhere. My friend ran it on "zsh with powerlevel10k configuration and MesloNGF font." That is, it is platform-independent and convenient, in my opinion this is enough and this is its feature and difference, for example, over tiv.