Maybe you missed the memo that the new price now includes the previously separate SW licensing cost.
Latest firmware for a # of DSO's has removed the SAG1021I SW license option and is the reason for the price increase.
Given that SAG1021I is both a compact AWG
and has an Isolated output, this device has a place with the 6 series of DSO's it can be used with.
With the withdrawal of the SDG5000 AWG's, SAG1021I is now Siglents only isolated output AWG.
However if a bench has the space, apart from not having isolated outputs, SDG1032X is a vastly superior instrument.