PH is incredibly important. 7.0 vs 6.0 is the difference in certain nutrients being absorbed by the roots or not.
obviously there are gardens out there where people do not PH at all and they have awesome results but, that also works reversed, where gardens dont PH and they struggle with nutrient deficiencies.
if you PH your water to proper levels you are not doing ANY kind of damage to the plant ( unless you are PHing to the wrong level). you are changing the root environment for adequate and complete nutrient absorption. you can allow the PH to swing a bit creating a diverse root environment that will effectively swing back and forth between the nutrients that are on the out side of the 6.5 PH window. nature is not ridged. it flexes so its only natural that temps, humidity, and nutrient uptake also flex...you control your temp and humidity for optimal performance of the plant...why would you skip on the PH balance of your soil which contains the most important part of the plant!!! (the roots
)
at the end of the day...taking the 5 to 10 mins during watering to adjust the PH is only going to benefit you, rather than if you skipped to save money or to save time.
There are alot of these charts out there that show soil PH levels and at what levels different nutrients are available to the plant.
I hope that i was clear with this post and that im not confusing. I am a first time grower with more book smarts than actual hands on experience towards cannabis cultivation..so if a more experienced grower would like to contradict my statements then fair play. all of the info i have given is to the best of my knowledge
good luck with your project and happy growing