please help me understand why NA is seemingly so bad apart from sentinels, even though basically the whole NA cs scene switched to valorant and there are way more investments done in NA valorant scene compared to other regions?
It's okay, man.
They always said that besides Sentinels, any team from NA like C9, 100T can beat anyone from EU. But they do not see that they precious teams are struggling hard against T2 teams, while C9 lost a few moments ago.
They won a tournament in a game and they are on their high horses. Let them have it and enjoy it after the pent-up frustration over the 2 decades. It won't last long anyways.