There are two reasons for this.
Plastic shower floor tiles.
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With ready for tile floor pans you can use ceramic porcelain mosaics or even a pebble tiles on your shower floor pan.
This floor expanse is only broken up by the curb.
These tiles are a slip resistant flooring option great for showers locker rooms saunas and the like.
Mosaic tiles are the most popular choice for shower floor tiles.
There are also more grout lines present between mosaic tiles offering much needed slip resistance in the shower.
One is so there are enough grout lines underfoot to provide traction for slip resistance.
Plastic fiberglass showers may be inexpensive and efficient but can take away from the overall look of your bathroom.
Professional craftsman can install ceramic tiles but hiring a professional is costly.
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Shower floor tiles should be no larger than 6 x 6 and 4 x 4 or smaller is recommended.
Under this pebble floor and glass block curved shower system is a ready for tile pan reason 4 if sleek drains are your thang ready for tile is the way.
The small size of the individual tiles means they conform to the slope and shape of the shower floor better than a larger tile would.
These plastic tiles are mold and mildew resistant and are very easy to clean and sanitize.
The other is that you need small tiles to cover a sloping floor.
One option is to install decorative ceramic tiles over the plastic shower base.