Apart from the obvious changes in technology, especially those of camera bodies, there are other reasons we change the equipment we use. I am wondering how yours have changed...
Speaking for myself I have, since I went digital, two kinds of cameras: small compact cameras with fixed zooms and small sensors (Canon G1, G7...), and DSLRs with a stable of lenses ranging from wide-angle to super tele. With injury I found the latter harder to carry and so I went for MILCs: Canon M1, M5's and the small (admittedly slow) lenses that go with them. Since an operation to improve my mobility I can now carry my old gear, but I still use the MILCs and have engaged with what I call the "super compacts" G1XMkIII, G3X and G5X - small fixed-lens zooms with 1" sensors. Perhaps as a result of getting cameras drenched I have got the Olympus TG-5 and the Nikon 1AW with its waterproof zoom.
How has life changed your choice of gear - did you change with tech (a common reason), to make your gear more convenient to carry or to take on trips?
And what do you do with your old gear? Still use it, sold it, gave it away, started a museum?