I'd like to thank everyone for their input, I've been reading everything and 2.4Ghz. is still working just fine. If need be, an ethernet cable is in hand ready to go.
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I can easily stream a 4K movie from iTunes to the ATV4 using 2.4gHz.
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The problem with sticking with 2.4GHz is that the WiFi bandwidth may (and in my case isn't) enough to stream high bitrate local videos (from my Mac to ATV 4K let's say with Infuse). Or maybe with iTunes 4K HDR/DV content.
But sure, if that works as well, there is little reason to switch to 5GHz or Ethernet. Mostly some faster apps downloads for people with high internet speeds.
I can easily stream a 4K movie from iTunes to the ATV4 using 2.4gHz.