I just really, really do not understand the mindset of someone who doesn't use voice chat regularly and doesn't have a dedicated headset coming in to a thread about voice chat and writing off complaints as circular bitching and saying there's an easy solution... if you don't use voice chat and also don't mind not having convenience or clear audio in both ears.
I use voice chat literally every time I game, I just use it with the same group of people, so we hop on skype or a discord. But I realize that's not the specific situation being discussed here.
Again though, I'd be curious to know what solution people were predicting knowing that voice would come from phone and game audio would come from the Switch. A splitter (or in this case, a reverse splitter), seems like the actual only way to do that. When we found out voice chat would be handled through a phone, you have two options;
1) You put in one earbud into the phone, and listen to the game through normal TV/Switch speakers
2) There's a splitter to route both audio streams into the same source.