Exactly, Seafile is the best I've found so far but a clean re write of the basic sync features would be great.
Seafile for example has full text search locked behind a paywall even though tools like Elasticsearch could be integrated into it for free. Even the android app as filename search locked behind a paywall. You have to log into the website on your phone if you need to search.
Pathetic state of affairs.
I had NextCloud on a Ryzen 3600 with NVME zfs array. While faster that my previous Intel atom with HDD + SSD cache, Seafile blows it away in terms of speed and resiliency. It feels much more reliable with updates etc.