Not sure if this is all a conspiracy from the tool and toolbox makers.
When I started the shop sockets where all in SAE of course but we had one set of sockets 1/2 drive standard length and a couple spark plug sockets. With a set of open ends,box ends, ignition wrenches, a couple adjustables, and screwdrivers we could fix almost anything that came up.
To fix the same percents of problems today we have 1/4,3/8,1/2,3/4 drives in SAE and Metric, with regular length, deep, spline, flex, impact regular, impact long, torx, torx security, torx plus, torx plus security, e torx, triple square, 8 pt, metric and SAE hex bits, spark plug in many more sizes. Extensions and gizmos in sizes or lengths unheard of. This along with metric and SAE flex ratchet wrenches, regular ratchet wrenches, 2 sets of combo wrenches in SAE and metric long, mid, and short sizes. This is just getting started.
No wonder someone asks if two jobs can be done with one set.