Guitar fret out of tune

Is it just the G? Because the G string has long been a problem for guitarists, and not just because of retreading the same tired, bad joke. The problem is that the fret system is not perfect, partly because different string gauges, but for a lot of reasons I don’t entirely understand. If you look at true temperament frets, the problem is clear:
https://images.talkbass.com/attachments/tt_formula1_lay-jpg.2072388/
This is how you get every note to sound “right.” Notice how far the fret “wiggles” for the G string, especially at the first fret? That illustrates the issue. The best you can do, short of getting your guitar refretted with true temp frets, is adjust the intonation so it all works best in the area of the guitar where you tend to be on that string the most. And use bends.
It certainly could be there’s a larger issue on your particular guitar, and if you’re still concerned, you might want to have a luthier look it over, but if it’s only G, this is my inclination.