A good thing thing about Nextcloud is that by learning one tool, you get a full suite of collaboration apps: sync, file sharing, calendar, notes, collectives, office (via Collabora or OnlyOffice), and more. These features are pretty good, plus, you get things like photo management and Talk, which are decent.
Sure, some people might argue that there are specialized tools for each of these functions. And that’s true. But the tradeoff is that you'd need to manage a lot more with individual services. With Nextcloud, you get a unified platform that might be good enough to run a company, even if it’s not very fast and some features might have bugs.
The AIO has addressed issues like update management and reliability, it been very good in my experience. You get a fully tested, ready-to-go package from Nextcloud.
That said, I wonder, if the platform were rewritten in a more performance-efficient language than PHP, with a simplified codebase and trimmed-down features, would it run faster? The UI could also be more polished (see Synology DSM web interface). The interface in Synology looks really nice!
The thing I don't get is that based on the article the front-end is as bloated as the back-end.
That said there's an Owncloud version called Infinite Scale which is written in Go.[1] Honestly I tried to go that route but it's requirements are pretty opinionated (Ubuntu LTS 22.04 or 24.04 and lots of docker containers littering your system) but it looks like it's getting a lot of development.
rewriting in a lower-level language won't do too much for NC, because it's mostly slow due to inefficient IO organization - things like mountains of XHRs, inefficient fetching, db querying etc. - None of that will be implicitly fixed by a rewrite in any language and can be fixed in the PHP stack as well. I think one of the reasons that helped OC/NC get off the ground was precisely that the sysadmins running it can often do a little PHP, which is just enough to get it customized for the client. Raising the bar for contribution by using lower level languages might not be a desirable change of direction in that case.