If your orchid isn't in water culture does PH matter?

[Cymbaline]

Okay so when I first started my orchid journey I read a LOT to try and learn because .. I don't want to kill a 15 year old orchid. My aunt would probably haunt me. I inherited them if that's confusing.

I ran across this blog that seemed to make some sense. He talked about how he adjusted his water's PH because certain nutrients were taken up or released at a lower range of PH . Like below 7.00 and then others around 7.00

So my normal tap water is HARD like at 8 almost 9 ph. Someone here mentioned that since I have a water softener that uses potassium the potassium could build up with my orchids and harm them.

So I have a RO system for them and my carnivore plants. I have enough of them to warrant buying my RO system.

But my RO water is like low 5 PH. So I've been adjusting my water with PH up liquid to be around 6.5 to 7.0 when I fertilize.

I'm running low on PH up and I figured it was time to ask this question. I searched the forums and it sounds like the consensus is that unless my orchids are in water culture , adjusting the water's PH isn't necessary because who's to say that the orchid's medium won't change it?

Is that right? What do you think? Thanks for your time.