Originally Posted by
FBinNY
True, but it's a consideration. If the designed pull ratio of the derailleur is less than the lever, there may be inadequate travel with an index lever.
On a front derailleur the ratio is usually not much of a problem. If there is a problem with inadequate travel it will more likely be due to inadequate offset from the seat post. Front derailleurs are relatively cheap and I'm assuming that the OP can recognize real obvious problems like clamp diameter size or unusual geometry weirdness.