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I think that you might eventually want to have several different “G arrows” in your quiver. The “four-fingered” open G is not necessary, but it is nice to have as an option. Having the ring finger as an anchor when transitioning between open G and open D is nice, so it’s really handy for those G-C-D (I-IV-V) songs.
But there are other times when I need to grab a 3-finger open G with the middle, pinkie and ring. This is very hard for me to do, but it’s important for me to develop more skill with that grip because there are a few things I play where I need to keep the index finger free to fret a C in the first fret of the B string, making a Gadd4 chord. The songs in which I need that Gadd4 sound do not sound nearly as good if I substitute a G chord. Also you’ll want an E-shaped barred G and probably some other barred shapes, but you might not need them anytime soon.
I don’t say any of this to intimidate you. Learn what you need when you need it, and accept that the johrney is long, with many stepping stones and choices.