Well, let me see how spoiler-free I can make this...
1) Mac's place was specifically designed to counter this.
2) In Cold Days, the location in Chicago that Dresden rested in just happened to have architecture that made it ok to have electronics.
3) In the first few books there was more of a mention of Dresden's power affecting the Blue Beetle. In later books, he seems to have much less trouble (including in more modern Hummers).
4) In books like Fool Moon it talked about how even being inside Murphy's office her hard drive would blow if not unplugged. In later books like Changes he seemed fine inside an FBI building and I think it was Turncoat when he was in an accounting firm's office where his deliberately hexing a phone didn't phase the computer.
I am subject to be off a little on these examples, but these are ones that came to my head while attempting to solidify why my perceptions are such.
My point is simply that it seems to me Butcher is trying to tone down how much Harry's anti-tech aura affects the outside world.
I'll concede that Butcher has set up some places that are more friendly to magic than others but I don't think he's toned down its effects on technology.
Just for instance, in the Turncoat example you gave Harry nukes every electronic on the lawyer's desk including the computer, and the cellphone inside her coat pocket. Mind you that was a deliberate Hex and since then those have gotten even more impressive.
In the FBI building he was worrying about vampires, not intentionally Hexing anything, and it would get annoying and break the narrative pacing if every time Dresden had run into a room he said something like, "And because I wasn't too calm things started blowing up, because as I've mentioned, Wizards and technology don't get along."
Now, if you want to make it so some wizards are more tech friendly that's fine. If something is taking the place of fouled up technology and is the equivalent in inconvenience like say, for some reason his power puts out fires, thus making any form of vehicular transportation other than a horse drawn carriage impossible, then I'd actually price it as a
-0 Power.