We have made some progress in that direction over the years.
We do have products like TA and MapleSim, which are built on top of Maple. There are also packages and toolboxes for Maple geared towards particular application areas, such as control design (Dynamics Systems) and Finance, and there are collections of MapleSim components for particular types of engineering (such as modeling tires). There are also 3rd party products based on Maple that specialize in different areas, such as structural mechanics, and applications from the Application Center from a variety of engineering domains and other specialities.
The challenge, in part, is that is difficult for one company to be an expert in so many different fields. (And sometimes even two members of the same field will disagree about how things should be done, which makes it harder to design something that will suit everybody.) So part of our focus has been to supply the technology to support the underlying operations common to many different domains (e.g. math,plotting), and provide the tools to make it possible for the domain experts to create their own applications. We then provide ways to make it easy for that expert to share their work, such as the application center and the MapleConnect program for 3rd party products.
Having said that, we do continue to look for ways to make Maple more accessible to different professions. So you will continue to see more specialized packages, in various forms, as well developments in the core technologies and sharing methods.