Jet2 : it's not the cabin crew job to clean the cabin. Well,maybe in some LCC is,so I'm not amazed there is a crew shortage on those lcc.
The most important aspect of the cabin crew job is the safety of the pax,not their comfort.They're not your mommy to tuck you onto sleep,more likely your chief sarge who'll take you out alive from danger.
If they're nice with you,consider it a plus.
I personally dislike the politics of some lcc to put the cabin crew to clean the cabin,after doing their job in the air.If you think they have a easy job,try it for a month or so.
Next,we'll put the pilots to check tyre pressure,and change the oil.
And I doubt the money saved by cleaning the cabin goes into cabin crew pockets.