Business needs can be slower to deliver
When the traders want changes to the system behaviour, such as the set up of new rules and conditions and the new categorisations of things, it is generally not possible for them to bring this about themselves.

It is often difficult to translate between their business needs and the technical implementation and configuration of the systems such that the needs are actually delivered. This work must be delegated to IT or support staff to analyse the changes required and make it happen within the constraints of the system's functionality, or develop additional components in-house to fill the gaps.

Traders can find the systems hard to understand
The concepts, terminology and user-interface elements of electronic trading systems are often not easily understandable by traders, business users and business support staff, and therefore much of the maintenance and understanding is delegated to technology staff. When things go wrong, it can be hard for the business users to know why. Generally, business users and traders tend to have less confidence in systems they have less understanding about, and can feel that such systems are a hindrance and not a help.