I have the same problem and the same TV....no HDMI switcher from me. For now I had to resort to unplugging the dock from the HDMI when I'm not using it. It sucks.
Anyone else have problems with PS4 Pro HDR/4K not working with the TV Arc settings on a sound bar btw? Same TV.
I was going to recommend plugging direct in to the TV, but that is apparently not the issue.
I use a HDMI switcher, and my son's Wii U would always take over the HDMI signal, as the switcher would always go to the most recent signal, and give it priority. So when the Wii U was in standby mode, it always does some off the wall shit, and it would interrupt me playing other systems attached to the same switcher.
The fix was to go in to the Wii U settings, and turn off the "quick start" mode, so then when the system was shut off, it stayed off, and would never interrupt. My son didn't like that as the system would take to long to boot up each time, so I gave the Wii U it's own port on the TV, and then I had to manually go to that HDMI port for the Wii U image to be used. There should be some kind of option within the NS to keep this issue from happening, but it might be another thing "N" didn't test, or anticipate, but that should be fixable by them at some point with a patch, they just need to know the specifics to add the proper option within the NS.
I have the same issue with the joy cons. They are tiny for my man hands. I really want a Pro controller but refuse to pay $70 for that controller.

that. Nintendo should have realized that adults would be playing on this thing.
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Like I've said before, that is not their way. They'll build something for themselves(or Japanese users in general), and then address other issues as they pop up. Or they just want to make sure they can sale you the pro controller. Either way, they win.