I have seen the same problem. Like you: nothing is done with the 2nd extruder. All things buildplate adhesion supports model etc. Only extruder 1, yet somehow Cura thinks the purge is necessary.
I have even had prints where the 2nd extruder gets heated up to 100 degrees standby temp for no usuage.
Simplify3D had a tendency to do the same untill I edited the startup script and removed the purge.
I guess you could do the same. A bit of googling should get you the change extruder and purge commands. Remove them from the gcode and it should be fine.
Still, I agree with you: why would it do it in the first place.
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oobdoo 8
Mach doch den Bereich in der Ecke rauer als den Rest von der Druckplatte.
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