I haven't really get involved with the FSG stuff before, but I think both of the following things can be true.
In a sane football world where no club is owned by a petro-state (Newcastle, City, PSG) or bankrolled in a bizarre and suspicious manner by a proxy petro-state (Chelsea), then FSG would really be the best owners going. The club is transformed economically, the stadium is now the right size whilst not causing disruption and losing its history, Liverpool 2023 are basically Liverpool of old but bigger and better.
But.
We don't live in a sane football world anymore, and FSG's model of ownership is never going to keep us at the top table. For that we need to sell our souls to the devil. Arsenal never really had a chance last season. United are miles off. Chelsea are a mess but they will win the title again before either of those two. If Liverpool did have another £100m to spend 2 weeks ago and had signed Lavia and at least 1 (probably 2) more players, I genuinely think we would have been in with a very good shout of the title, second-favourites at least.
Any success we have had on the pitch was a combination of 1 shrewd sell (Coutinho), two transformative signings from that money (VVD and Alisson) and a string of extremely successful mid-level transfers (eg Mane, Salah, Robbo). When everything is not pulling perfectly together, we lose ground because we can't compete financially. We can complain all we like about City, Chelsea making the football landscape insane but it is what it is and it isn't going to change.
The main reason we have had any success is having the best manager in the world. As other's have suggested, when Klopp goes we are fucked.