Sometimes a project genuinely can't follow a standard. The question is whether that deviation is visible and time-boxed — or quietly becomes permanent technical debt. That's what an exception process is for.

Standards without a way to deviate get ignored under delivery pressure. A formal exception process lets teams deviate when justified — openly, with a record — instead of doing it silently.
A waiver with no expiry is just permanent debt with paperwork. Every exception should have a date by which the deviation is resolved or re-justified.
The exception register is one of the most honest signals of architectural health. A growing pile of ageing waivers is an early warning; bring it to every Design Authority.
The Architecture Practice Setup Kit includes an exception & waiver process and a tracking register, as part of a complete governance operating model.