Interestingly, this fella started HIT and got less (zero injury actually) injury than last time when doing high volume.
For me, the biggest pro is time savings per week (fits my schedule, i spend too much time for cycling and then running). I like to train for strength/muscle hyperthropy (but not bodybuilding) but then i dont like to grind. Grinding is only for cycling, that's the only enjoyable grind/endurance activity that i experience.
Hit 1 working set and FO for the next 3-4 days.
This is also for folks who recover comparatively poorly and take longer time (eg seniors)
And yes, i kinda like see progress faster as well rather than just grinding away mindlessly and not seeing progress sometimes. (risk of stagantion is higher)
And yeah, i am experinging more DOMs actually - nowadays is 72 to even 96 hours of recovery for just that 1 warm up + 1 working set.
~ 2-3 weeks in, i can actually now see my 3 different deltoid muscles.

And the new striations

(im about 15% body fat)
Past 1 year plus i trained, nothing much, though i did get to ~ 20 dips.
Also, he reported that his overall health and immunity improved, coz not constantly grinding and possibly overtraining, causing possibly immunity drop due to overtraining and/or under-recovery. He has never been sick while on this while previously he was sick much more often.
Coz now is hit it hard, and recover harder.