Because those powers are very broadly defined. ThatÂ’s the mechanism through which the Federalists and states righters negotiated something that both could live with.
And that compromise has worked and created the country that we benefit from living in today.
How are they broadly defined in a document that specifically set's forth a very limited scope of activity by the federal government.
i.e.
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
And yet the congress (and more importantly, the SCOTUS) has chosen to inject itself into the religious doings of communities.
Jefferson's infamous "wall" has no application beyond federal politics.
States supported state religions into the 1830's with no pushback from the federal government. The states chose to stop doing it...but the point was they did it and they could still be doing it. But if they tried today, the SCOTUS would overreach it's scope and get involved.
So, no they are not broadly defined.