'Apart from profit, what is missing from every single last one of these systems?'

I guess the answer to that is long term profit being number 1 reason as mentioned.

No. 2, and this is the biggy, being the total lack of any systems ability to 'reason'.

Possible success for any system is adding reason to it's selections but then it's no longer a purely mechanical system.

Systems are a great way for new punters to enter the fray without too much damage but the end goal is to be able to 'do the form'. Only then has a punter any hope of being able to eventually [and only in rare cases if your good enough] make small % profits.