I can see benefit in the 2.5G on the LAN side if you connect a disk to the USB port and have it function as a NAS. It gives you enough bandwidth for the full WAN speed plus headroom for that.
I've been using SSHelper together with rsync for years and it works perfectly. You can log in the first time with a password, and place your public key to use key based auth going forward.
In addition to doing this over WiFi I also often use a usb to ethernet adapter (usb side plugged into phone) to get better performance if I'm doing larger transfers, for example copying off a large number of photos.
Edit: looks like there's a note on the play store page about incompatibility with newer Android versions. Disappointing. I guess I'll have to find another solution when I eventually upgrade my phone.
I actually only discovered silverbullet a few days ago, but liking it so far.
The TreeView plugin is documented here: https://silverbullet.md/Plugs/TreeView