Germany had a badly designed prototype reactor with 80 incidents in 4 years of operation and one particular incident on the 4th of May 1986 - a week after Chernobyl accident, where reactor operator was lying about it. No wonder they have those regulations and general public distrust in anything nuclear: https://en.wikipedia.org/wiki/THTR-300
This is like asking a painter why the hell he used ready made paints and did not create his own for each color he needed. Not everybody has a hobby of spending time and money fixing tracing mistakes of PCB revision 11, playing with working contraption is fine as it is.
Andy Serkis was great, but not as good at shape-shifting.
For LOTR renderfarm WETA bought a bunch of SGI 1200 dual core Pentium III 700MHz servers with 1GB RAM, 9 GB SCSI disks all running RedHat Linux. I've read at some point they had 192 SGI 1100 and 1200 servers working.
That's the thing, the manufacturer can rate the cells at any C they want. The real question isn't whether these are "rated" for 10C, but how much degregation these will show after 1000 cycles at 10C. Cooling systems will also play into this: If we assume 5% charging losses that's 50kW that will need to be dissipated while charging for the cells not to heat up - no small feat even if the losses are lower.
I remember that my first soundcard was Miro that I thought would be a forgotten historical artifact but vogons even has a wiki for it https://www.vogonswiki.com/index.php/Miro_Sound_PCM12. Such a strange device with multiple compatibility modes.