Hello and welcome to the forum

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There are some different c7-c5 lines after 1...g6. Having a very Benko-like line lurking (as well kinda) is somewhat pleasing. Mostly having a lot of different choices is nice.
A problem I've found after both 1.d4 d6 2.Nf3 g6 3.c4 and 1.d4 g6 2.Nf3 Bg7 3.c4 is that finding something remotely likeable that avoids the position after 1.d4 g6 2.Nf3 Bg7 3.c4 d6 4.Nc3, which in turn is an annoying one, has always seemed quite hard. This 3...c5 Benko-esque line does work against the (d4,Nf3,c4,Nc3) order of moves quite effectively. That ups the appeal a fair bit. Basically 1.d4 g6 2.Nf3 Bg7 3.c4 c5
4.Nc3?! cxd4 5.Nxd4 is not so great for white since the d4-knight will immediately get effectively challenged by 5...Nc6.
For a somewhat c5-inspired part-repertoire one could pair the line with say:
1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 Bxc3+ 5.bxc3 Nf6 6.almost any move 6...e5
Not so known, but pretty solid.
1.d4 g6 2.c4 Bg7 3.e4 d6 4.Nc3 c5 5.d5!? Bxc3+ 6.bxc3 e5
Similar to above.
1.d4 g6 2.c4 Bg7 3.e4 d6 4.Nf3 Bg4 5.Be2/5.Nc3 and 5...c5 in either case.
Have a nice day.