The greatest thing about Barcelona getting this win isn't just football or fandom, but also financials as well. Real spends their money to get the best players in the world and build a 1+ billion dollar worth starting eleven, whereas Barcelona just gets their players from La Masia.
Honestly, La Masia is an insane youth academy, I think 7 players were from there, obviously someone should double check that, I just "know" but I trust my knowledge there, I do not have a proof, I didn't check all of them, but if I am not wrong they had 7 players from la Masia in the game. That is insane and they still managed to beat Real Madrid with ease, and destroyed Bayern Munich as well. They are looking like old Messi days Barcelona once again.
Barcelona's current financial status was the reason many of us thought they'll not be able to compete with Real Madrid in the Spanish La Liga this season after the European and Spanish champions signed Kylian Mbappe to add to an already intimidating squad that conquered the whole of Europe and Spain last season but to our surprises, Hansi Flick have been able to maximize the potentials of the squad at his disposal.
La Masia is known for producing football geniuses over the years but it seems they've released another couple of players that's gonna dominate Europe once again. Barcelona is currently exceptional but I don't know if they'll continue to be this impressive throughout the season