I think on mobile it's lost to the keyboard as well as a general purpose input tool - the hardware and networks weren't there to support it initially, on-screen

I think on mobile it's lost to the keyboard as well as a general purpose input tool - the hardware and networks weren't there to support it initially, on-screen keyboards have (massively) improved and people have grown more familiar with them, and devices have grown considerably as well which allows for an even better typing experience.