There's always a tradeoff between reliability, security, flexibility etc.
AFAICT, the idea for witness votes was to be able to cast unlimited amount of votes for witnesses that are "good enough", it was limited to 30 for practical reasons, as you can see it's even hard to keep that number well maintained.
And no, Yuchen-Gate wasn't allowed by 30>20 thing. Please keep in mind that in case where witness votes would be limited, whole landscape would look different, i.e. change would also affect current witnesses, not only his suckpuppets (sic!) It's just a math. This was discussed many times in the past (including live discussions during HiveFests (rebrainding, right?))
"Seemingly nice" isn't really a good attribute to decide whether someone is a suitable candidate for a witness or not. I'm not nice. :-D
No inconvenience. Thanks for looking out on how to improve Hive :-)
Indeed. That's why I don't work with HR. Soft spot for nice yet incompetent people for the job. Will take node stability and update reliability more for the time being.