Not a powershell fan here, rarely used it.

But 'Bash for decades'? Is that true? A quick search for bash 1.0 shows me tarballs from '95, which isn't yet decadeS old.. Ignoring the question of whether bash is the optimum shell and that some systems migrated to replacements (think dash, all the zsh lovers).

So that last line of yours seems a little over the top.