To be fair, replacing "important" with some less generic synonym is like one of the first tips in any Copy Editing for Dummies book, and definitely suggested by Grammarly, for example.
Any word can become generic when overused. As more people get access to Grammarly and CharGPT, more of them will apply the same recommendations, turning previously rare words into generics.
Chose your words carefully, if lucky you might find some that only fit you.
Thus therefore to provide an example thereof one may replaces all instances of "important" or "essential" with "splendid", "brilliant" "magnificent","gorgeous" or "sophisticated".
—"The carriage of goods under international commercial law is a sophisticated and gorgeous aspect of international trade."
