This thread legit turned into a pudding thread lol..... l can only speak for myself and what I’ve learned from my personal experience. I’ve spent about 20 years in the gym (with some breaks \ off time for various reasons), and was natty for about 14 of them (this can alter the effectiveness of training styles).
For me personally, volume has been key to putting on size / developing muscles past the “fit guy” look and reaching the “body building” look. Again, this is just my experience. However, this is not the case for my whole body. For me, smaller muscle groups (I.e.) bi’s, tri’s, traps, etc., frequency is key. Training arms 3x a week does more for me then training them once and doing 4-5 exercises of 4-5 sets for bi’s and / or tri’s. My delts actually respond well to both. I can train delts high volume twice a week and then throw in another day or two of presses and lateral raises and see gains from that. However, I also boxed for years which may have forced my body and my delts to adjust to dealing with intense workloads every day.
Also with chest and back, my body responds well to dips or push-ups and pull-ups or chins a few times a week, but the real changes seem to occur when I go high volume on the bigger muscle groups 1-2 X’s a week. Honestly, this seems to be the case even off-cycle. Again, not saying which works better, not giving a scientific answer of a definitive A or B, just saying what works for me. Frequency builds my smaller muscle groups best, high volume and TUT has been most effective for my larger muscle groups. Best of all is when I can mix it up just a little bit so my muscles are stimulated frequently, but only truly “worked” once or twice a week. But hey, that’s just me.