95th%ile income, given to people with randomly distributed incomes? first law they pass: "we get to keep this job, we need to get rid of sortition, it'll never work!"
This is a strawman. Since this body would be organized by the constitution, it can trivially eliminate that risk by just setting a duration of their term, which they would not be able to overturn.
same type of strawman as inequitable distribution of wealth being a problem, or highest achieving members of society especially those born with advantages do not make good stewards of government