I wasted much time doing reps in the (deadlift). Knowing what I know now, if I had the time to start over I would do percentage based singles (off the floor) every other week with downsets for high reps done off 4" blocks. On the off weeks I would do high rep stiff legs or RDL’s.
The back is comprised of fibrous tissue with a poor blood supply, so IMO you really should train it like a ligament/tendon - Heavy and Brief or light and long duration. Think of laborers who use their backs for 8 -10 hrs a day. After years of that type of activity their backs get strong as fuck.
There are people of course who can make progress with intermediate load/intermediate volume deadlifting. I wasn’t one of them.