Instead of speaking in generalities, how about giving some examples of how Trump is going around Congress in running the executive branch?Making the government more efficient is great. But doing it by attempting to do it by either going around Congress when Congress must approve it or creating or terminating agencies, another power given to Congress rather than the President, and attempting to take power granted to other branches or wholly create new powers not granted by the Constitution are all things that amount to a power grab by a president. and we've already seen Trump try a majority of those to bring more of the federal government under his direct control.
Here are two examples that prove you incorrect in your statement. doing it by attempting to do it by either going around Congress when Congress must approve it or creating or terminating agencies, another power given to Congress rather than the President,
Both USAID and the Dept of Education were created by Executive Order. They were not created by Congress. Any agency created by Executive Order can be terminated by Executive Order. Congress has nothing to do with it.
If you want to talk about a power grab, let's talk about the Judicial Branch interfering with the President's ability to run the Executive Branch.