I'm not talking about shitty instruments. I'm talking about really good, high-quality instruments that you haven't learned how to make the most out of.
Most people would struggle at first with most new string instruments - whether it's a viola, a square neck guitar, a mandolin, a banjo, etc. I don't understand why people are so resistant to a learning curve.
You ask why? Because different kinds of guitars sound different ways. You can't expect to pick up a classical or a Selmer-style and expect to sound like John Williams or Django. Ditto for any style, even if it's more subtle.