Why because only int'l wide bodies experience fatigue
No, because of this.
How about a P-3 24 hours of duty, 17 hours of flight time, no stops, three pilots 0100 to 0100 the next day. Does that count? How about a DA-20 18 hours duty, 11 hours flight time to six stops in two different foreign countries with two pilots. Does that count? Or does it have to be in wide body, with crew rest station to experience fatigue?
and when you ad more cost, less people purchase the product. May be very good for senior peo0ple, not so good for everyone else
Since when do you need a wide body to augment or put a bunk in it?
You just need a company and flight department management that does not have their head where yours apparently is. Or the FAA to get theirs out.