Well, after every shower we squeegee the tiles, even though one of our showers is built with masonry. Water stains, soap residues... otherwise that leaves unsightly marks, especially in the grout. A glass wall is much easier to keep clean. Ours in the shower bathroom, anyway. Squeegee and that’s it.
Besides, the shower area dries better this way.
Using a squeegee or not... everyone can do as they please. It is certainly not necessary after every shower. Not even with glass walls.