But it might; that is the other half of pragmatism. Being pragmatic is not just a softer way of saying self-defeatist.
And don't be so dismissive of theory. To quote W. Edwards Deming: "Experience by itself teaches nothing...Without theory, experience has no meaning. Without theory, one has no questions to ask. Hence without theory there is no learning." Just doing what you discover is done in practice provides absolutely no room for improvement outside of rare flashes of intuitive brilliance. Theory is not just an abstract description of what has been observed concretely so far; by far the greater value lies in the ability for theory to predict what has a likelihood of being observed in the future. Having a theoretical basis to work off of will give those experiences context, and will give you the ability to do a much deeper analysis. And analysis, if the comments Sara received are any indicator for, is something we need to be doing a lot more of.