"Unnecessary workload" refers to tasks or responsibilities that are not needed or required, adding extra work or burden without any purpose or benefit. Full definition
Where this does not happen, then challenging unreasonable expectations about marking will help reduce unnecessary workload, while also enhancing teaching and learning. (neu.org.uk)
We are supporting teachers to tackle the issue of unnecessary workload. (theguardian.com)
We will de-clutter the curriculum and strip away anything that creates unnecessary workload for teachers and learners, and we will take forward a new programme of reducing workload in schools. (educationbusinessuk.net)