Coutinho is a real gem if there's a coach who knows how to get the best out of him. €100M was a fine price for him considering that he was really good under Klopp back in the days. But Barcelona lost Neymar so they had to sign another superstar for a big price
There are players that could explode under a specific role - Salah for example is amazing under Klopp but he wouldnt be as great playing for someone like Allegri for example..
Coutinho for me was a 60M player and now is a 100M as prices inflated. Him doing tricks doesnt impress me.. What impresses me is how a player fits tactically what he decides to do when he releases the ball , vision etc - Its a combination...
Dybala for example could be much better than Coutinho in my books..
Messi though is the ultimate player as he can do it all and has an amazing vision