Not quite - the origin of "You're holding it wrong" was a response to someone who was quite literally trying to illustrate the cellular signal attenuation issue

Not quite - the origin of "You're holding it wrong" was a response to someone who was quite literally trying to illustrate the cellular signal attenuation issue by pressing down with their fingers on the gap between the two antennas. I believe the parent was saying that the performance of xcode varies based on the project. This is true - breaking projects up into more modular setups has long optimized project build speeds. The quality you get out of your tools is in many cases based on how you use them. "You're holding it wrong" would apply if you were deliberately using the tools in a sub-optimal way to try to prove a point.