We're moving towards 'Extended Learning Tasks' atm - I teach English, & it's going to be full steam ahead for KS3 in September.
The argument is that it should, if thoughtfully set, provide genuine additional learning - so in some of our pilots, for example, students have built a model set for Macbeth & delivered a presentation on the process & the decisions they've made; or directed & filmed a scene using family members as actors, & producing an annotated 'director's text' & a director's diary; or have independently watched & compared in essay form several film versions.
Obviously, being able to choose the task is brilliant for student engagement.
I teach a lad whose literacy SEN means that he has always seen English = frustration + humiliation. He built a stunning model set, based on an Antony Sher theatre production he'd seen a clip from on video, & gave a confident & assured presentation on how he'd thought the production was great, but the design wasn't gruesome enough, so he'd got his Art teacher to advise him - she'd steered him towards some Chapman brothers dioramas, & he was off.
I've got the end result on a shelf in my teaching room. It's admittedly fairly grisly, but it's going to be a fantastic talking point when I do Macbeth again next year. & for this particular student, he a) had a blast & b) got properly to grips with Shakespeare, hunting down grisly horrible quotes to support his presentation!
I would make a couple of caveats:
Some subjects (MFL & Maths, off the top of my head) need regular drills/practices. Doubtful whether ELTs could ever replace conventional HW in these.
You need a definite learning outcome - another student created an animated film using Simpsons characters. It took him hours, it was well done & quite funny, but it had bugger all to do with advancing his understanding of Macbeth! Likewise the girl who simply filmed her grandparents reading the scene where Lady M goads Macbeth into killing Duncan - could've been very successful if she'd actually directed them & reflected on her decisions...
& yes, there must be teacher feedback, linked to the learning.
I'd be interested to know how you get on, OP!