I wouldn’t hit the gym just to hit one hour straight legs… I’d rather have a bit of legs in every workout while still hitting upper body hard.
I’d find that more enjoyable as a pure matter of personal taste
Forgive me hardcore bodybuilders, I’m just an amateur willing to be big while having fun!
I have not used a template like the one you describe, but I train lower body every gym day, as either the main movement or as the secondary. For example: log clean and press (main movement) supersetted with pullups and core, and then deadlift/squat variation (secondary movement) supersetted with non-exhausting triceps variation (eg, rope pushdowns). I have been doing full-body training for years and I have seen good progress.
The modified split is also ideal for those who hate leg days because you’ll do a small amount of leg work every workout instead of devoting two entire workouts to legs.
But, I’d say this to OP, have you considered a 3x/wk PPL split instead? That has you doing legs every third session