That’s been my learning too Petko.
Aiming to keep things simple is always best and if what ever you are trying starts to feel too complex then take a big step back and do some thinking!
Also fallen victim to trying to manage far too many demo accounts. Finding the golden middle ground as you say with regards to simple systems and the amount of tests you are running at once is really important otherwise it can all get too messy and its easy to end up learning nothing because the lessons are all to jumbled. Less haste is more speed as they say :-)