To think they should employ someone to cover holidays?

[Moreorlessmentallystable]

I work an office job and it since it's a big team, pretty much every single week there is need for cover for at least 1/2 members of staff. AIBU to think the department should employ someone permanently to cover the person/ people that are on holiday? When we are covering for other team members work just accumulates and the customers don't get as quick service and I feel like it also leads to errors and so much stress when you come back to work that has not been completed while you are on leave and it's time sensitive. This is stressful for the person that has been covering too, as they are pretty much trying to the job of 2 people. How does it work in your office?

Sadly you are assuming that customer service and employee satisfaction is more important than profits.

... are more important...

Are all members of the team doing exactly the same job that just one person could come in a cover for all those different people?

Yes, with very slight differences for some specific customers but most processes are exactly the same, and all systems used are the same.

At the place I used to work at, a different member of staff was allocated each day as the 'floater' who would check on the files of the absent employees and action them accordingly. They would leave a note on top of the file for the next 'floater' to see.