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Discretionary does not mean arbitrary.

It can and should mean.. logical methodical  a SYSTEMATIC check list that is ticked off...

Only recently did a computer beat one of the best players in a chess match.

If a Discretionary system is SYSTEMATIC Given enough computer resources

It could be coded... But The very best so called Discretionary systems maybe

have too many variables hence two many relationships to weight

That call for Judgement beyond what a reasonable amount of $$ in today's computer can achieve..

Big Blue (was that the name of the Computer) How much did it cost?

I bet the variables in the markets are even more convoluted

BUT... That does not mean that there is any real discretion in the rules and principles that should be applied..

eg crossing the Road

System..... At the traffic lights.. Green = walk

discretionary..... Away from the Traffic Lights

Now You can not cross in any way safely  outside a time tested logical that can be broken down to a check list ..

The discretion is in a way illusionary..

However to apply principle to practice requires

Judgement and experience

So crossing the road becomes intuitive and safe

But to someone who always waits for the Green light

reckless guessing and gambling with life and limb..

That said the method does have to have a completely real logic

based on reliable feedback..

Shutting ones eyes and crossing at the same time as yesterday.

Or on the count of four have No logic to start with..

A method must be Scientific in approach..

And flexibility is important...

motorway