Is pH adjustment really necessary for fertilizing in S/H?

[WaterWitchin]

I've never bothered testing pH regardless of using a traditional bark mix medium, sphag only, or semi-hydro. And over the years have used tap water with a 8 to 9 pH, down to straight from the R/O system.

Only thing I've ever really seen a difference in growth or bloom was when using tap water with high pH and really high TDS, then switching to R/O for more sensitive genus, e.g., Phrags. And that wasn't about fertilizer... way too high TDS.

Does it make a difference? Maybe to a botanist, a commercial grower with a lot of money to make or lose, or someone who's just really into biology/chemistry. To my hobbyist eye, not worth the effort.