On the Pros/Cons, every time I used the services of a personal trainer they see when I flinch, when I twist a finger, when I can (or cannot) do one-more-rep, correct every centimeter of my body being off. This is 100x times more valuable than "next week do 50kg"
Perhaps that would make sense for (very) experienced people that have nailed the technique?
Do you have some videos/gifs showcasing each exercise?
Side-note: I'm in the EU and I am getting this message on Android store: " App not available - A testing version of this app hasn't been published yet or isn't available for this account."