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I totally get where you’re coming from and if there was a lean and stable app for files, calendar, contacts and tasks I would be very happy to check it out. But last time I searched there wasn’t anything I would trust.
Also, it looks like roundcube is now part of nextcloud 🤷
Have you tried Material Files (it’s on fdroid)? It’s genuinely great and it supports different remote protocols, although I haven’t personally tried this feature.