Again, Switch codes are there because your name on the switch is non-exclusive. It’s quite frustrating typing that 12 digit code in my opinion.
A better solution to avoid spammed friend requests would be to be able to toggle them on or off (Suggestions exist such as oshawott’s), since like with the Switch system it’d likely be more frustrating to use in that way.
Don’t get me wrong — I like the concept, I just don’t like the idea of sacrificing user experience when the system already works with exclusive names.