OP is pretty clearly not grasping the difference between high volume in a single session VS. total weekly volume.
OP: suppose that you train legs once a week and really blast them. Say you do 10 sets of squats, then 10 sets of leg press, then 10 sets of leg extensions, then 10 sets of leg curls. (That's a shitty leg routine, but I'm just making a point)
Now consider the following alternative: your first leg day of the week, you do 5 sets of back squats, 10 sets of Romanian deadlifts, and 10 sets of leg curls. Your second leg day of the week, you do 5 sets of front squats, 10 sets of leg press, and 10 sets of leg extensions.
Which of those approaches is "higher volume" ? The one where you shove as many sets as possible into one workout, or the one where you actually do more total sets per week by doing 2 more moderate overall sessions?
"Volume" means more than the number of sets in a single workout.
If your preference is still to blast them with as much as you can handle in one day and then rest a week until they're recovered, hey, it's a free country and some (likely assisted) bodybuilders hve certainly built fine physiques that way. But you might at least consider the possibility that doing 2 leg days/week would actually allow great "total volume" than you're doing now.