Harry mentioned in Turn Coat that different wizards affected Technology to different degree's (and that he is one of the worst out there). I always assumed that there were a number of factors, but that the different flavor's of magical abilities affect different technologies to varying degrees, in addition to raw strength being a factor. Harry says his fundamental power set in all about moving base energies, and he can move more energy at greater range than most (owing to his extensive tracking experience), though with less subtly and minute control than many in his tier. There probably isnt much more of a set that would innately futz with what we call "Modern" technologies than that. Molly still hexes things, though of course doesnt have the raw muscle to do it as broadly or well as harry, but has been shown unable to use electronics (Warrior) or be in the room with life-support equipment (SmF). However she was educated by harry, and so has a similar base mode of magic as him. Somebody who learned a different skill-set from a different school of magic might affect certain technologies differently. For example, a specialized Air wizard might affect a combustion engine or an aircraft worse than even harry, but have less effect on power electronics (vs the uber-fragile nature of cell phone level electronics that will fry regardless). The Alpha's are not Council level but are still considered significant talents as compared to Paranetters, but apparently dont have a problem with MMO's; but they have a much more internalized and 'natural' view on magic. I could easily see an advanced Neuromancer or healer translating their talents to manipulating electronics. I could see an Earth Mage managing enough electromagnetic control to shield them with some level of success, or on the flip side could see such a wizard able to Hex mechanical systems like guns better than even harry by hexing the metal shapes into warping directly.
Just my 0.02