Of course it does. You need to have played the sport, sure there's Mourinho, one in a million, but at the end of the day, how can you understand an industry if you've never been involved with it..
Like who? Of course not all good players become good managers, obviously, so many things incorporate being a manager, whats the % ratio of good managers that were involved with the sport to one's that were not? Hmm, let me think? 90% were footballers and involved with the sport...
You need to have played the sport..... straight away provides an example disproving what he just said.
Do you intentionally do this every post to make yourself seem insane or is it just a happy accident.
LVG is a professional so automatically knows more than anyone not in football, he chooses to play three at the back and not play Fellaini as a DM(because three managers at least all think he's crap there including Moyes)... you say this is because they are defensively weak... you then say you chose a narrow 4-3-3 with Fellaini in and less CB's ignoring this advice. Either a manager knows more than you because he's a manager and you aren't thus he must know more than you, and you're wrong, or you know more than LVG....
You also have used the basic argument of intellectual footballs that Fellaini is strong so would therefore be a good defensive midfielder, club and country managers disagree with you... FELLAINI disagrees with you, but you know more than me because you play football(maybe) and I don't.
Why are 90% of managers ex footballers.... because they are within the same industry and there is an obvious career path. Most other people have chosen a career by what should we call the average starting age of managers, 35-40, so there isn't really a natural career path from accountant to football manager.
it's also an old boys club where clubs frequently chose ex players(completely ignoring experience or suitability) to be a new manager... why, because they have a relationship with the club, basically nothing else. They hope they'll be a good manager and the owner is great friends with a player who was there for 5-10 years so gives his mate a chance even with more experienced and proven managers as an option.
You failed to mention that probably 90%+ of managers get a season, if that, they disappear into obscurity because the majority of managers are crap, again footballers, often rich, can try management on for size and lose nothing if it fails. Bill the accountant who has been an accountant for lets say 20 years, who isn't a millionaire and can't afford a punt at management because he'll likely fail then be left without a job.
There is a reason most managers are ex footballers, and it is because it's what's always happened. Mourinho is PROOF, absolute proof it isn't needed. This kind of thing happens in other industries and situations, oil industry, other things, where a select group of people make it very difficult for outsides to get jobs within it kind of thing. The reason most managers are ex footballers is for social reasons, not technical or logical reasons.
There are probably 20 crap ex footballer managers for every actually good ex footballer manager. Does a 5% success rate suggest footballers in general make good managers, doesn't to me.