As bodybuilders trying to grow or even maintain size - you need both heavy compound which apparently thicken myofibrillAr strands and higher reps and extended sets create tension / occlusion for sarcoplasmic fluid expansion / hyperplasia . Lately more research around bodybuilder methods are confirming many principles that have been used over past decades. To transcend beyond normal you need to do more than just lift heavy straight sets. Especially is you dabble with aas and hgh you want to get your money's worth . However even off cycle one can mAke progress if you take a scientific approach . The info is easily available now too.
Hitting each muscle from different angles is more than just couple of exercises - compound , stretch position and contracted angle . That's why all variation with even so cAlled lateral raise is relevant . The press of some kind will always be the main shoulder builder . Even incline Bench hits frontal total delts, dips etc. depending on our own individual shapes we mAy need variations if lateral raises. Much research is showing potential for stimulating growth can be emphasized during the partially stretched portion of a repetition . Different exercises can emphasize this too. Such as the incline lateral , cable lateral . Most machine or nautilus more contracted position of flexion emphasized but still vital . Pretty much midrange compound exercises like squats or bench press etc can help trigger testosterone release , the stretch exercises helps produce hormones in the muscle and hyperplasia and contracted exercises like machine laterals , leg extend etc- temp block or obstruct blood thereby producing a floods of it after sending nutrients . Variety of stimulus is needed to hire beyond normal . Not just heavy weight. Not just low reps . Longer sets time under tension will actually bring deeper fibers into play than a compound exercise alone . In some cases more practical to employ with isolation exersize as the weight is lighter overall . Strip sets like I referred too going down the dumbell rack I do heavy initially but as I go to lighter dumbells I'm extending my set and time under tension. I've hit the deep fast twitch fibers with heavier weight , but as time expires I'm actually splitting fibers and recruiting more due to time it takes to complete my set while I maintain constant tension .
We can also go to individuals exercise itself - full Reps, then partial pulses . Ever see Ronnie Coleman do shrugs ? He does shit loads of pulses at end to extend his set. After full then only stop before full stretch or contracting . And/ or find sweet spot which scientist have decided that each exercise does have a so called sweet spot that if after you complete a full set don't stop do pulses on the sweet spot with constant tension. One Japanese study found the subjects could increase hyperplasia 8 times faster in a two week period . Just meaning you can really boost gains with these bizarre adjustments to a set. None of it is new either- Arthur jones who invented nautilus had similiar ideas. Larry Scott a BB from the 60s performed his preacher curls like this and it was his forte. Arnold again did stuff like it, not that we all can be pros but they want to be the best of the best and do what works . We too want results - I say try every thing . Staleness and boredom will never help