goes on about the caucus system without
the realization that legislatures are involved
in this; I also think that that particular system
serves the repugs more than the Dems.

delegates from both the caucus and the primary. Only the WA Democratic Party has chosen to only get delegates from the caucus. WA has a great mail in ballot primary. I believe the Democratic Party chose the caucus in order to depress voter turn out.

Why would the dems want to suppress voter
turn out though?

to keep some voters away. My father didn't get to vote because he is a Christian and had a commitment at his church. Our caucus was on Easter weekend(I also don't think that was a coincidence either). He missed the opportunity to fill out a surrogate affidavit that would have allowed him to vote early.

people here get extremely worked up over the caucus system, as if it's brand new every time.

I believe that in some states it's the local party that determines which it will be, but the money and the state legislatures are also involved. In any case, everyone who wants their state's system changed needs to spend the next few years working on that.

But I expect Iowa will still be doing caucuses five thousand years from now, so I wouldn't hold my breath if I were in that state.