Well, yes.
We test as much as we can, as soon as we can,
and ideally, risking as little of our capital as we can.
If we find that historically some combination has worked in the past,
can then evaluate whether the current/upcoming conditions are similar enough now
that similar behavior might repeat again.
And even then if they are likely to repeat,
if the likely returns from the scheme aren’t going to exceed
some other far more diverse / less risky / simpler alternatives available,
then sounds prudent to just stick to the alternatives instead. 
Can a proposed scheme beat 4-5% return (after taxes) ?
If not, then T-Bills, Liquid-ETFs, DICGC-insured bank FDs, …
might be better alternatives depending on the liqudity-profile one desires.