I don't disagree.
I don't DISAGREE with the choice made, I am just surprised by it. The non "Ässault Rifle" appearance seems plausible, if somewhat belied by other forces in the same uniform suiting up with Beretta M12 SMGs.
I've owned and shot a Mini-14 since 1976. My favorite taunt among the "black rifle" crowd is "MY .223 will do anything YOUR .223 will do, except JAM", which of course, is not strictly true. The ARs can be made to shoot a great deal tighter. I believe that the barrel harmonics associated with the first ones were "less than optimal", let's say. This can be fixed, at least in part.
I've never had the money to do it, but I've always wondered how the rifle would fare in combat with the harmonics optimized for the 6x45mm cartridge. I suspect that an 80 grain FMJBT at 2800 f/s would offer certain advantages to the rifleman who must shoot for keeps. I DO KNOW about the "never adopted by any military power", major or otherwise, so practicality would be an issue. I am nonetheless free to speculate.
For confrontations happening at usual "AK distances", I wouldn't feel under-equipped with a Mini-14, or M556. The gas-operated cam-induced rotating-bolt system in the Mini has been used in many iterations before 1976, and its reliability/durability is well established.
I just wish I could have heard the discussion among the French procurement people leading up to its adoption.