I mean it's likely that games will have their own voice chats, but if you want to use party chat with your friends (like on PS4 or XBO) you will probably need to use the phone, which is incredibly stupid.Crisis averted!
While the US-page shows this:
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The Japanese site shows this:
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which translates to "Headphone and Mic-Jack - You can connect headphones, a microphone or headphones with integrated microphone"
So Switch can use regular headsets, which are very likely to be used for voice-chat, etc.