Perhaps without duties to investors or depositors they aren't hung up on rules and risk mitigations, specifically a banker being able to make decisions based only on their own judgement.
They are more risk averse than normal bank, they trade growth to stability.
Random story - I worked with one of the Hoares many moons ago, in the banking industry. Funny to read this on HN.
Like how I don't have to have health inspectors come investigate my kitchen to make myself lunch.