Maybe one could say doctrinal changes and technological changes alternate, prompting each other in turn?
For instance, the French adoption of massive fortifications in the late 1870's through the beginning of WW1 in increasing sophistication resulted in a doctrinal change on the part of the Germans to deal with the forts with firepower (which turned out to be just as effective on armies in the field as the forts), which resulted in the development of modern Howitzers and Mortars, howevever the opportunity to develop a set of heavier-hitting, faster-moving weapons wouldn't have been possible without a hydraulic recoil system, which the French had already invented.
Or, thinking about it a little more, it's really doctrinal change vs doctrinal change, with each doctrinal advance casting about for any off-the-shelf technology that might be available to fulfil it. Faced with Germans using firepower and combined arms tactics, the allies decided the solution was a "breakthrough." So they developed and used tanks to try and break the German line. Unfortunately the tank's time was not yet come and they hadnt' developed methods for exploiting a break in the line (if they could ever make one.) Of course by the 30's the demands of the doctrine ended up bringing viable machines and formations into being.
So... the French adopted the old idea of a chain of forts in depth.
The Germans responded by creating a firepower doctrine to deal with forts that involved the new off-the-shelf French recoil system applied to howitzers.
So the allies responded by trying to develop tanks to support the concept of a breakthrough even though the technology wasn't yet ready for the concept, but which later caused it to be fully developed.
However the Allies never really mastered the Firepower or Combined Arms doctrine the Germans were using against them, even though they had the technology for it all along, even prior to the war.
...so, using WW1 as an illustration, it seems like doctrinal changes bring on doctrinal responses which introduce existing technology for the first time or stimulate development of new technology.
As for Alexander and Philip, surely the doctrinal response to hoplite warfare resulted in the faster-moving, denser, farther-reaching phalanx? (along with the use of a refused/back-echeloned flank with meticulous drill?) ...and surely this in turn made all further conquest possible?
As for the gold mine, Philip made an offer to "protect" Crenides from Thracian "aggression" and then moved in with soldiers and miners once he got an invitation. (most likely an invitation solicited by Philip in the first place) However this didn't make the Phalanx possible, as Philip had already learned most of the concepts in Theban captivity and then had already created a heavily drilled infantry along those lines and used it to beat the Illyrians.