Sekiro was fine as it was.
I don’t need every single From Software game to offer an expansive co-op and PVP online suite, and the idea of forcing people to play through Sekiro‘s trials and tribulations alone made it stand out. You are a lone wolf, after all. Naturally, I’d also be okay with online play eventually making it in.
This mod from LukeYui speeds that process along.
Source: Destructoid New Sekiro mod adds Dark Souls-like online features