@serenity56,
One reason is that, because of philosophical disputes over the nature of 'reality', its bedfellow 'truth' is a grey area. Pragmatists, for example, argue that 'truth is what works' or 'truth is what is good to believe'. Once you deconstruct 'truth values' as used in traditional logic, and once you understand the transient and contextual nature of epistemological progress, then formal differences between logical forms become a secondary consideration.