Depends on how you implement it. neovim's implementation uses libvterm, which seems preferable to a from-scratch terminal implementation. Implementing a fully capable terminal emulator from scratch definitely isn't a weekend project.
neovim's approach links libvterm in via C. You could potentially do so via python and ctypes instead, but then you have to count on having a vim compiled with Python support.
neovim's approach links libvterm in via C. You could potentially do so via python and ctypes instead, but then you have to count on having a vim compiled with Python support.