And the point is that PSG first windows were successes unlike City's, their strategy worked, they improved the club massively.
The first three years brought, Matuidi, Ibrahimovic, Maxwell, Verratti, Thiago Silva, Thiago Motta, Marquinhos, Cavani among others. Unlike City, PSG actually had a successful strategy when QSI purchased the club and during the first years. Things went sideway later, around 2017, when they had to replace these players and someone else, Antero Henrique, was in charge.
The issue here is that you seem to not accept the idea that PSG isn't defined by a singular strategy, in reality the strategy that City followed post 2011 is closer to the strategy that PSG followed from day one. The issue for PSG is that they went away from it during summer 2017 when they spent 200m on Neymar instead of spreading their expenses on a mix of veteran and young players.
So would club use PSG as a model? The 2012-2016 version? absolutely because that's the strategy followed by most top clubs, that's how Real Madrid, prime Juventus, Bayern, United or AC Milan used to operate. While the post 2017 version is how the likes of Inter or Barcelona operates and that's stupid.