...If someone isn't a professional coach, or semi-pro coach, it is difficult to be hypercritical of someone who is, and a coach who is also is very experienced, such as Popa. He has won an Asian Champ League too...
There are two aspects to this in my eyes.
First, is the assumption that someone who is not professionally trained has no value. An elitist principle that is as one-sided as the views of 'ignorant' supporters who do not understand the range and depth of issues impacting on a manager's tactics, strategies, formations and selections.
On this forum there are a lot of former players who have a true understanding of the game; who can see faults, flaws and weaknesses in a manager's thinking and application through the school of Bin Daren Dunnit. We have others who have observed football at all levels through supporting, playing and officiating who also have unprofessional views that have a foundation in experience and understanding of the game.
The absence of a piece of paper and professional training does not render opinions invalid or less worthy - and opinions that suggest a level of inequality could almost see someone being targeted by harassment and unfair negative attention for the expression of that opinion.
The greatest failing I find in myself these days is the focus on the minutia during games. I tirelessly run the ball with every play, personally compete in every challenge we make and have the vision of an eagle in every moment watching the screen - seeing danger and screaming in my head for someone to shut it down. It is hard to simply watch a game and let it flow over me which is a little bit of an entertainment loss - but worse it creates an unfair system in my head for rating individual players in games and an unrealistic expectation of perfection in every moment. Combine that with a system that limits the attacking chances and the players who limit those chances (Behich for example) or fail to capitalise on them in front of goals (Duke for example) are thrust into the spotlight of my perspective.
The greatest positive about a forum like this is it allows me to have the benefit of many brains and eyes which do not see things the same way as I do. I have learned plenty participating in this forum - and perhaps the most important side product is observing that the merits of an argument have everything to do with the 'facts' and views presented and nothing to do with the occupation and qualifications of the person giving them.
That is not aimed at you specifically - it is a genuine confirmation for me that every genuine (not trolled) opinion is worth considering.
The second aspect is about Popa.
When you play a system of 7 defensive players and 3 attacking players you have to get the right players in the 3 to make your system produce. You are also relying on the 7 not to make mistakes because it only takes one poor defender to allow one great attacker to beat you. Popa wins games by having a resilient defence and trusting in the 3 to score - he did a similar thing to win the Asian Champions League.
It is very easy, and I would argue relevant, for an untrained and paperless supporter to be hypercritical of a manager whose selections only seem to support the back end of the field and the defensive side of his methods at the expense of the vital 3 attacking players. Duke is exactly that case - selected for his hounding abilities and limiting our creative attacking play to 2 players only. It is a weakness in Popa that deserves discussion and fair criticism to me.
TLDR:
A London taxi driver without training professional football qualifications who has followed football for years has the right to be correct and to be hypercritical of a manager when they can see weaknesses in the manager's methods.
Popa requires 3 good attacking players to be truly successful and often sacrifices one or more of them to be more effective without possession. This is a flaw deserving heavy criticism in our national team setup.