Give me a good reason........

[mapper]

A single stage is a very important tool. However don't overlook a turret press, which can be run as a single stage.

or self indexing when you have a good grasp of the processes..

a lot to be said for the die being directly over the center of the ram....especially in sizing operations
rifle I will run in single stage mode, manually turning the turret from charge to seating die..with prepped brass.
or do multiple operations on the same case..all about options for me.

pistol, i will run in indexing mode and pull the lever 3-4 times for a complete round.

but that is what makes it interesting..there are a lot of ways to get there.
and none of them wrong. they all have their benefits.

this was a acceptable compromise for me.. (cost, precision, speed, caliber swaps, single stage use, etc..)
every one is diffrent.

but all this is off topic anyway.. op was about a single stage press, which always serves a need on a bench for something..and makes great precise ammo.. and no matter which one, you need to understand what is happening in each process.