It is a known problem. Every generation of Pi has been a little bit hotter than the previous. Pi4 runs very hot - not just the CPU but several other components on the board are generating more heat than previous generation. The result is that many people consider active cooling necessary.
Flirc case will help to cool the CPU a little bit but it is a bad design because it's a mostly-sealed metal box and only sinks heat from the CPU. With many other components generating more heat, the air inside will heat up something terrible and it will slowly cook your RPi. The material also makes it much harder to cut holes for venting or add a fan.
I wonder how the Pi 4 will behave with enclosures such as these that are basically one large heat sink for all chips.Would make it easy to carry around also. I refuse to rely on active cooling. A Pi has to be completely silent to begin with, and I travel quite a lot so the less parts and wires that can break the better.
I'm seriously enjoying my Pi 4 despite its initial issues. Minor issues that is. It's just so much more powerful than the Pi 3. Kodi has never been so responsive on my TV screen. It feels as if there's a full blown PC hiding behind the TV somewhere. My Pi 4 is not in a case yet and that's fine. That way there is no heat issue whatsoever. And no fan mind you, just a small heat sink on the SoC. USB power delivery is fine with an original RPi power source or any plain USB charger with high enough current output. I wouldn't want to use an expensive phone or laptop charger with it anyway. I'm patiently waiting for a good case to become available where I live. And for the time being I'd still pack my Pi 3 if I wanted to use Kodi on the road. Sure there are issues but simply don't expect to make full use of the hardware yet (such as running HDR 4K60 video) and just treat it as an overclocked Pi 3 for now. The rest of the awesomeness is on its way.
