Just in short, I think there is no need for “why and whats good about it”:

What about LASH in ardour?

as far as i know dave robillard is now the maintainer for lash, and dave is an active developer for ardour.
a few time ago i’ve also asked if lash will be supported, and paul told me that there is some code for lash in ardour, but currently nobody was working on that.