In commerce, companies hire a 'consultant' to do the dirty work for which they do not have the stomach and wish to skip the blame. Politicians do the same. In short - it's what humans do.
Sometimes, a person who has been in an organisation/company/political party for many years can see what needs to be done and has enough knowledge of the organisation to do it. However, for the most part, organisations tend to land up supporting themselves. Some charities, after 50+ years find that keeping the charity in place becomes more important than the people it was formed to help. Humans are not very good at change - the Pandemic is a superb example of how difficult it is for people to change their behaviour.
This does not mean I am a fan of Cummings for he has proven himself to be a liar and that is not good. Particularly when his boss is a serial liar too.