Seems same level of complexity to me as adding a VPN into the mix.

Not really. With a VPN, the only change is that the networking between A and B now go through a tunnel with no changes to A or B. But if you get a seedbox, A is completely removed from the picture and you just have a connection between B and C.

dude, at least for tv/movies, just use ultra.cc (cheapest plan) and kodi can connect to it via https so no need for vpn and you don't even need to to download anything - super easy

you can even pay more if you really need plex

The level of complexity is running a rsync cron job every X minutes to check if you have new files to transfer back home.

It's not exactly rocket surgery.

So it's more complex and slower.

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it can take a long time to sync files home if they are large enough/your connection is slow

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fair, i moved away from a seedbox because it took so long to sync back home