I don't think it's easy for most people to make device behind their IPv4 nat available.

Also the firewall won't provide the same security, here afaik it also handle auth for you (only approved clients can connect), so you don't have to worry about how secure the auth is on the server you're exposing.

(for most people doing all those things securily would likely take much longer than 10min, and unless they're very technically savy I'm not sure how much secure it would be)