If you look at bicycle designs through the last 100 years you will find many fixed gear models that were fitted with horizontal drops which made wheel removal easer when many bikes came equipped with fenders.

Conversely, coaster and internal hub equipped bikes came with track ends... the ability to use a tug nut on a three speed ensures that the wheel stays in place and does not throw off the shifting.

Many people think my '55 Raleigh is a nice conversion buuut it came with a fixed drive and horizontal drops... my '51 CCM has track ends but was sold as a coaster equipped bike and wheel removal on these is a pita when you run fenders.