Technical debt is the enemy of fast change – and of DevOps. It sometimes hides under the covers while new features are being delivered but, much like financial debt, it will never go away unless it is addressed directly.
At some point your technical debt will reach critical mass. This is when it starts to hinder every attempt to change, while forcing you to spend more time fire-fighting and managing the debt rather than delivering new features for the customer. This growing technical debt mountain will seriously affect your business ability.