Unless I’m missing something, this approach will only work in hospitals which have a lot of theatres suitably equipped for whichever procedures they were running the HITT lists for. If a hospital has, say 10 theatres, typically they are designated to specialties, so eg three would be orthopaedic, three surgery, one ENT, one Gynae, one urology, one ophthalmology. Each specialty has very different equipment needs for imaging and instruments, so you couldn’t turn a gynae theatre into an orthopaedic theatre without major investment, and only then if the theatre had space to house both sets of equipment. Then you factor in the emergency workload, so you need to have theatres available at all times to cope with RTA, ruptured aneurysms, eye injuries etc. etc.
I know from experience, there isn’t a magic bullet to solve waiting list queues, it takes a whole patchwork of solutions, different for every hospital, to maximise capacity. HITT is one (not new answer), and is applicable in very specific circumstances, generally in large sites with a dedicated theatre suite for each speciality.