Dual-floppy LCs were rare. I only saw one batch of them in the field when they were in service (they were in a school library). I believe Apple also sold LCs and LCIIs with only one floppy and a hard drive at one point. As I remember from the press in 1992, Apple discontinued the dual-floppy configuration due to slow sales.

The dual-floppy SE made sense given trends from the year it was released (1987) but there was never really a call for a dual-floppy LC since most color software took up more than one 1.4MB disk, especially those that came out right after the LC was released.

The LCII was a cost-saving machine in general and eliminating the floppy connector and removable slot for the drive on the front of the machine helped tremendously in that respect. This also explains why the plastic piece to hold the speaker and fan is not on the LCII and later models.