What I've found beautiful about -J is the host you jump through requires no privileges on the final host. Only my laptop has the SSH key to access my home server, not my cheap VPS.
And this allows me to have zero open ports on my home internet. I do a reverse tunnel to my VPS from my home server (in a FreeBSD jail), and that port is what my laptop client jumps through.
And this allows me to have zero open ports on my home internet. I do a reverse tunnel to my VPS from my home server (in a FreeBSD jail), and that port is what my laptop client jumps through.