And if the system was indeed changed, how was that accomplished?
by and large, no, the system has not changed.
to use your words, you may get the "impression" it's now like a "monarchy" because trump is loud and loves executive orders--both're a departure from recent norms.
being loud, as a president, can indeed influence others, but that's why he's being loud--to influence them, because he as the president lacks the power to make the choice for them.
executive orders can do a lot, and quickly, but they have many legal limits, and future administrations can simply throw them away.
interesting part about them is many presidents will keep a number of the previous administration's executive orders, even when they were critical of them in the past, even when they were from the opposing party.
political theater.