>>1
Dash is great for scripts (because it's very fast!) but it doesn't have Readline support. I think there is a patch that adds support for libedit, though. Alpine Linux has pretty good default shell with Busybox's ash (it also
has command history). Also, OpenBSD Ksh is pretty good. It's not bloated but it has good quality of life features. There are 2 Linux ports of the OpenBSD verson of Ksh but I can't remember which is the better one.