I don’t think it necessarily needs to evolve… but maintenance updates would be hugely welcome.
That said, I can completely understand not wanting to put engineering time into legacy products (sad day for my Machinedrum, though… still nothing compares to it on the market, imo). I would absolutely love if it could be released as an open source project for the community to continue development. I do understand that this alone may be a challenge… but worth some time to invest for all of the users that depend on it.
Yes, I get there are alternatives like the open-source Sysex Librarian for Mac… but it’s not entirely tailored to Elektron kit in a way that C6 is, so I can understand community interest in wanting to keep this app alive with future OS releases. That said, if Elektron is dead set on sunsetting C6, and is not interested in sharing the source code… I think it makes a lot of sense to invest in 1-3 hours of time making for formal document around exactly what devices need to replace C6 functionality with alternative midi tools. Even a 1:1 doc for Sysex Librarian would be welcome here, so that anyone asking “how do i…” can simply be pointed to that information.