I know this from first hand experience, as I am a highly skilled person and people seem to consider me as uncharismatic (which is an illusion, as I actually can be very charismatic if you actually get to know me in a positive way).
The thing is, the universities and many people otherwise on a power trip (such as the "Julia Stewards") fail to invoke the hidden charisma inside me. So to them, I seem as a very uncharismatic person who needs to be ostracized and banned.
So, a highly skilled person like me who is perceiceved as not being charismatic (due to having a spine and backbone against people on a power trip), will be ostracized and banned and not get opportunities.
However, the less skilled people who are perceived as charismatic are often involved in secret gossip and backstabbing and are less technically skilled, yet they get promoted and receive the most opportunities.