If you look at the long arc, multitools are basically the latest expression of “the soldier’s small implement.” Roman legionaries had tools split across the contubernium; Napoleonic armies leaned on pioneers; WWII pushed compact personal kit as armies mechanized and radios proliferated.
The trends changing multitools today map well to doctrinal shifts:
1) Electronics everywhere. WWII field telephones to Cold War radios to today’s networked optics—maintenance moved from “sharpen and pry” to “tighten, adjust, replace small parts.” That favors drivers, bits, and fine tools over big blades.
2) Professionalization and standardization. Modern armies run on TMs/tech manuals, torque specs, and replaceable modules. A multitool becomes a bridge to proper maintenance, not a substitute for an armorer.
3) Load carriage evolution. From web gear to ALICE to plate carriers: slimmer profiles and one-hand access matter because the tool is carried on armor rather than in a ruck.
It’s not unlike the Cold War shift from bayonet-as-primary mindset to “bayonet as last resort.” Likewise, the big knife on a multitool becomes less central as the soldier’s “work” becomes adjustment and sustainment. For sources that show the trajectory, Keegan’s discussions on the changing face of battle and the postwar professionalization of armies help frame it, even if they don’t mention multitools explicitly.