The only thing is bothering me is your math with 1.3 million is 6.5 % of 20 million. Where did you get this number??? That's not 20 million players. I tell you till October I already did 8 times tactician.
Based on PS5 trophy statistics 12.4% have completed the game. I assume it is similar for PC too. There is a large drop between the prologue and the end of act I. 86% have escaped from the Nautiloid, but only 40% reached the end of the first act. This is not uncommon for these types of games. People stop playing for all kinds of reasons. It is not necessarily related to difficulty. That being said, it is pretty safe to assume that BG3 was quite challenging to many players. It's a niche game hyped into the mainstream.
