Things have changed and have been in constant change for a long time. And now it seems that everybody who occupies the White House does it and everyone else stands by and lets it happen - sometimes even facilitating and encouraging it as the only way to get things done given the normal logjam that has become Congress. In a way it reminds me of the history of prostitution in the Old West. There used to be a term for a woman who would perform certain actions that others were leary of - she was called A French whore. And today it is so run of them mill and accepted as normal that not a single woman in that profession would argue the point.
I think that is what has happened during the rise of the imperial presidency going back to the last century.