Trump isn't really a politician though he is a businessman who became president and I am not sure that makes one a politician. I think in the same vein as you while that helped get him elected it also made him much more susceptible to being resisted and undermined. He didn't have the correct people around him and used his family who were out of their depth like he was still running a business.

When you reach the level of President you are going to need politicians by your side who also will buck you. As much as I hate career politicians, especially in international issues they serve a good purpose because of the relationships they build with counterparts in other nations. At the same time career politicians hated how he operated and ran things because it was so dramatically different.

If he gets elected again I think there will be less resistance because so many career people left during his first term and those that have filled in for them now know how to operate and are in positions to do so.