Several of these sound like anti-features. Others are OS issues and have no bearing on the shell (i.e. ownership hot-swap). The ones that are useful have alre

Several of these sound like anti-features. Others are OS issues and have no bearing on the shell (i.e. ownership hot-swap). The ones that are useful have already been solved by other programs (screen, gdb, et al). What is the advantage of having it all packed inside the same executable?