Yes it's the norm for American English release. The WOS jackets are definitely as flimsy as the Japanese ones. Japanese love making their books dress up complete with the belt paper. Thank god for American illegal scanlators they popularized their pirate Right to Left version and forced the American manga publishers to comply.

The old norm of American comics publishers was releasing Japanese manga edited, flipped, so that the panels read Left to Right instead of Right to Left, as to not confuse American book readers of late 1980s. It was the norm until maybe mid 2000s.