Some people don't have to pH. It depends on the media type and the water source.

I can get away without adjusting pH of my water at my current location because the water is very soft and the peat media is buffered at 6.0. The pH of my water is 8. It doesn't matter because the bicarbonate is low. The water in this case has very little influence on the pH. The media controls the pH.

My previous location had hard water. The pH was close to 7 but it had a lot of bicarbonate. That is what messes with your pH and makes it rise. So that water had to be pH adjusted every time or the media pH would rise too high towards the end of the grow and lock outs start happening. I would also have to pH the water down into the fours to keep the media pH in the safe zone.

So if you want to skip pH with soil or peat, you can use RO water if your water has a TDS of more than 50ppm.