Because 5x5 3 times a week is retarted. You won't progress after 3 weeks due to CNS burnout. Moreover, the triceps isolation is f***tarded because your bench and OHP are never gonna go up with them there. The planned progression is even more stupid and unrealistic. Max you can run it is 3 weeks.

Jason Blaha basically just took Stronglifts 5x5 and just cincai add in alot of isos and exercise. It's brainless shit. He gives good advice, but dunno why he made such a shit routine.
Yes, SS can be done by anybody actually. It's just the diet you need to suit yourself. If you fat eat at maintain, if skinny you may do a moderate bulk. Notice that SS doesn't have tricep iso.

I ran it for 3 months on a 600 sulprus bulk. Gained like 5kg++ in 3 months... bench only up 5KG in 3 months. Reason why for the stupid 600 sulprus was that i thought my upper body lift were stalling cause lack of sulprus. Perfect diet (I eat my meals in the bus also), all tracked, perfect sleep

Ontop of that, it overused/slightly injured my lower back due to excessive insane lower back work. Clearly shows he didn't even bother to check how the lower back is being overused due to the exercise overlap.

If a program does not have enough arm work, you don't/can't just solve it by adding 3 sets of tricep, bicep iso. You must take into account and be very careful if it will stall your main lifts or not. For example, Kethnaab SS only allows adding arm work on Friday, it's because u have Sat,Sun to recover from it, that also after awhile when you can handle more volume.

And about more volume for bodybuilding, you can't just take a strength program and make things go like 3x5 -> 5x5. You must make sure the trainee can recover from this increased workload by spreading this workload more evenly. Higher workload -> lower frequency. And this workload thing also must be calculated, e.g Weekly Workload.

Anyway just an example, you can make 3x5 -> 2x8 while keeping frequency same because the workload is about the same. But adding weight may be slight slower cause 8 rep range MIGHT (I'm not sure) result in slower strength gains.

You can't simply add arm work, increase volume... and make things "no more problems"..... it requires alot of thinking (workload calculations).

Nop, not at all.

Fierce 5 is well thought of by the author, especially the push:pull and shoulder balance part.

The progression is also weekly and much slower (Realistic) compared to ICF. The arm isolation is also once/twice a week only. It also goes by the 3x5 keeping volume sensible for novice. The author also advises a full deload each month showing his understanding of cumulative fatigue.

Best part is if you look at the squats, they switch between front and back squats. This is another good point because as stated in programming books and articles i read, the second heavy day should use a lighter variation of the original lift to allow recovery.

Realistic progression, reasonable volume, balanced exercises, deload recommendation, variation implementation, controlled arm work... it just shows that brains were used  to construct this routine.

I simply love it, and planning to actually run it myself (with tiny tweaks) when I start gym.

The only thing that I would change is remove the tricep isolation work. The author also stated that the only reason he added it cause noobs are gonna add it anyway.

I'm starting to get bored with people suggesting Starting Strength where there is a lot of other options for linear strength program

DO SOMETHING THAT FIT YOUR FITNESS GOALS AND MAKE YOU HAPPY

plus the assistance exercise on ICF, obviously you do the accessory for the pump lol aka for bb purposes

if you are not planning to go for a competition, just do something that you love the most, don't feel beat up all the time unless you are competing for a Powerlifting or Bodybuilding comp.

inb4 herp derp 5x5 gives proper growth
inb4 herp derp 5x5 is the only way
inb4 herp derp cns
inb4 herp derp overreaching
inb4 urine idiot