Graph question plot and plot2d

Guys,
I had to use plot2d() and plot() commands both with parameters to get a line plot with data point markers.
Used the rect parameter of plot2d() to scale the axes the way I wanted. Why aren't these plot functions more alike.

Thanks in advance for any effort to reconcile.
Ted

Please see sample code below:

//Use plot2d() command to graph data with scale limits parameters.
plot2d(x,y,rect=[Xmin,Ymin,Xmax,Ymax]);

//Use plot() command to graph data with marker and line parameters.
plot(x,y,"o-");