I've always admitted that I'm a massive Menottista and very anti Bilardo, but without a doubt you have to give credit to Carlos Bilardo's managerial record on all levels even if I rather disliked his brand of football. He was very tactical as was another Argentine in Helenio Herrera (Herrera more so) although in the case of HH he ended up naturalising himself French so we can discount him from any equation in cases such as these where Argentinian football is in question.
To cut what I could make into one of my trademark long posts, yes indeed Argentina were coached much better to be a winning formula in 1986 under Carlos Bilardo, but even Bilardo wouldn't have done much with this team.
You can have all the talent you want sitting up front waiting for the right ball to come so as to score, but if those behind you aren't good enough to win it back against top sides (because you have to beat the top sides somewhere along the line to win things) and be able to maintain it with aplomb and containing a certain amount of improvisation without being too blatant in what you want to do, then those players up front are worthless!
Theyre even more worthless because due to the fact what's behind them ranges from below average to ok and then a couple that are good, then that creates anxiety in the front men and when they are given a good opportunity out of the blue, they tend to fluff it more than they ever would at club level.
My gripe in anything concerning Argentina is where fools say that the Class of 86 were mediocre and that Maradona won it on his own. I lived that era live and watched as many games as I could, even friendliness... That team was good, not brilliant, but they were good and with the added factor of Diego Maradona, that became a winning formula due to Bilardo understanding the difficiencies in the team and making them play in such a way that those problems became almost null and void.
Tactics aren't just about understanding and studying your opponent as many seem to think it is. Yes its's vital, but a great coach also knows his team, his players and how to make that unit function in such a manner that any issues are brushed over with some makeup so that it all can be as seamless as possible.
I rate Sampaoli highly, a lot more highly than they do in his home nation where the general consensus is that he's a very dislikable character. Sampaoli has had that team playing a lot better than what they should be playing. He's had various instances of good football, compact football with the lines playing close to each other so as to not leave spaces which would be where you would make obvious how crap that midfield is and how mediocre the defence also is. He should be commended for this because that's why they managed to qualify.
Messi can only do so much.