The complete “operation” is very simple indeed and might be done in a few minutes (except the grinding). A complete rear wheel change (belt tension/kickstand length/brake caliper adjustment included) will take about 1 hour - if you’re used to.
You’re right, I mean…
I think we have the same problem here.
Two different materials are pressed together strongly - not good.
In case of the bellevue (cup) springs the effect is a crackling noise, in the case saddle bolt and nut is the effect the seized thread.
The reason is the same: seizing, galling, binding, jamming - of different materials.