You really should change the title of this article... So far from the truth. In short, Youtube is most likely trying to improve how they auto generates thumbnails for those who don't upload a custom ones. Nothing about their test or statement says they'll be straight up removing custom thumbnails.
And of course I'm not saying their "experiments" are ok. Very uncool. Much like your title.

Thank you for sharing the video! Although the preamp in the video is different from the hack one. It costs $99 but doesn't need to be hacked AND has 2 channels! Pretty slick.

I used to think the same, but it turns out unbalanced signals are actually fine for short runs. But if you start running 15+ feet you'll start getting into the danger zone.

I was going to say the same thing but you nailed it first.

Wow, don't mind the haters Renée. Keep up the great work.

Having shot on two GH4 bodies since they came out I would strongly suggest manual lenses with a focal reducer. Unless you shooting photos a lot and want manual focus. The GH4 is a completely different camera when you put larger lenses on it and use a focal reducer. You can save some money and get off brand focal reducers. I've used Roxsen adapters and have been very happy with them. Similar image to my Metabones adapters.

If you're really strapped for cash FD lenses with a Roxsen FD to MFT focal reducers is a gorgeous combo. You could get the adapter and several lenses for $300 or less!