So what you're trying to say is that full body workouts 4x a week, with less sets and lower reps closing to your 1RM may yield better results than isolating muscle groups once a week and lifting light for more reps and sets?
I could see this being true.
I might give it a go. Anyone have any good, more hypertrophy based full body splits they want to share?
Well, I think you should easy into higher frequency as you've been off for a while. Maybe start with 2x a week frequency, say upper/lower, then after a couple of months 3 times full body, and then after a longer while maybe every other day/4x a week.
Too much too soon can risk overuse injury. I got that for my knees when I moved directly from 3x to 5x a week.
Then, if hypertrophy is your goal, I def think you want a high volume, with slightly higher reps per set than PL routines. But I still think it is wise to stay away from failure (at least in the big compounds) if you should do a high frequency (3x a week and up). Failure too often can burn you out.
As for routines, I think you can just take SL 5x5, and add a bunch off BB accessories for all bodyparts every day. Say a leg curl, some arms, a vertical row one day, and maybe leg extensions, abs, and shoulders and arms again another day (on top of SL5x5). Maybe do some supersets, dropsets and giant sets, slow reps, pauses, etc...