Aswin, I like the modern defence very much, since I am a very aggresive player. I often play the Hungarian opening for white 1. g3 e5 2. Bg2 d5 3. d3 Nf6 4. Nf3 (or e3) Be6 and then thinking about castling. I often transpose it into Hippopotamus setup, and have beaten even 1900 players with these openings. Currently, I am 1780 blitz on lichess.org and I have to say that my opponents have far more little theoretical knowledge than me ( the chessmood courses have made me very confident in the way I play my repetoire). I don't play the Pirc defence a lot, because I find it a bit passive opening, and my opponents know how to play against it. The key to play the Modern defence is to give to your opponent the centre, but from the 4th move you start to undermine it, without trying to occupy it yourself. It is true that the openings starting with 1. g3 or 1. ... g3 are very fexible and can ajust to any opening which includes a fianchetto of the kingside Bishop.
I never play the pirc. It's very passive.Modern is very different compared with pirc.