I'm glad the post states that Roundcube will stay an independent product. Roundcube is on a whole other level in terms of stability and robustness compared to Nextcloud. I'm also glad that the current Nextcloud client will be replaced, because it's not very good right now.
The old product is ok yes. The company is awful, with their roundcube next scam though.
Edit: Yep that's the official position as per this post on the roundcube github https://github.com/roundcube/roundcubemail/issues/6030#issue...