Grandmaster Joel Benjamin shows games that demonstrate the advantage of having two bishops out of the opening. See one of the earliest true examples featuring Steinitz, to a modern example from Kasparov.
2020.02.20
Berthold Englisch vs Wilhelm Steinitz, London (1883): C60 Ruy Lopez, fianchetto (Smyslov/Barnes) defence
https://www.chessgames.com/perl/chessgame?gid=1132638
Gata Kamsky vs Garry Kasparov, Chess Olympiad (1992): E88 King’s Indian, Saemisch, orthodox, 7.d5 c6
https://www.chessgames.com/perl/chessgame?gid=1066688