1) You are the only one who somehow made the assumption that a factor 10 either had to be a factor ten more bit errors or a factor ten different baudrate or a factor ten different voltages or whatever you thought.

2) With too small capacitors, the ripple will seriously hurt the communication. With too large capacitors, you get much longer charge time until the chip is able to perform the required work. And you may get into troubles with the transistors because when the chip is powered up, they have to work way harder to fill the capacitors.

3) Too big capacitors means they will also keep they charge for a longer time after you power off the device. This may be damaging to the chip depending on how the chip is designed - you have 10 times the energy that may potentially discharge over an unknown resistance in the chip.