system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Who] Why do The Daleks even have a parliament in the first place?

Do they vote on things? I would have thought that Daleks don't have much to debate on.

"THOSE IN FA-VOUR OF EX-TER-MI-NA-TION?!"

"AYE!"

"EX-TER-MI-NATE!"

So what's the point of even having a parliament when every Dalek is pretty much identical and has the same world view?
gpt
Because the Daleks aren't just talking personifications of murder (close, though), they're a well oiled military machine.

Their plans upon setting down on a planet are not just "shoot everyone and when the dust clears hope it isn't us who lost". They take over areas the same as any species in the universe does - ease into one area, capture and enslave people, use them as cogs in the war machine, have them build you a base and spread out from there, etc.

There are entire planets out there under Dalek rule, where every man woman and child mines resources for them all day. No extermination required, unless they get rowdy, but even then they don't have to enforce it in person. They have Dalek Puppets and Robomen for that.

You also have to keep in mind that while they have no emotions, and they are passively linked through the Pathweb, they still have their own unique brains, every single one. There are always dissenting opinions on how to wage war, who gets enslaved and who gets killed, whether a small planet is even worth it, etc. They can argue without fatigue for ages on these topics, though indeed much dissent is instantly quieted by being overridden by a higher ranking Dalek.

So TL;DR the parliament is there to help all the Daleks work together, settle differences, and exterminate the universe more efficiently.