Including more basic (as of 2024) features in the core like Helix would indeed be a good idea but would go against the existing culture of vim with many plugins competing.
That's why I went with LunarVim, I was tired of maintaining my own plugins and configs, and wasn't quite ready to fully jump ship to Helix (though I do like the direction Helix is going, it'd be an easier sell if shells and everything had Helix keymaps).