If everyone starts from that template file, then they will all start with a file that uses STBs. But that file is one use of the CONVERTPSTYLES command from being a file that uses CTBs.
For what it is worth, anything you can do with a CTB you can do with an STB (and vice versa); the settings for a plot style are the same for both. The difference is whether the plot style is assigned based on object color or by a direct assignment of a plot style, independent of color. My firm uses, and I prefer, STBs.