Acrylic shower base with tile bench?

Is there any reason not to use a prefab acrylic shower base with tile walls and a tile bench? I get that tile walls and a prefab acrylic base are a common combo, but I don't see anyone adding a tile bench.

My thinking is we're remodeling both bathrooms in our house while living in it. We just finished the first one and just did the best things and spent the most time and money. We'd like this one to go quick and cheap. It's an odd sized space, so I'm still going to do a tile shower, but I'd like to avoid constructing the base. There's a place nearby selling acrylic bases for only $25 which will beat both the cost and time of making a custom shower pan.

This is one of the only pictures I was able to find on the internet that looked like the combo I'm thinking of– tile walls & bench with acrylic base (or maybe this is stone or something but you get the idea):