My philosophy has not changed. It will not change. If anything, those convictions grow stronger with experience. However, the culture of school and, in particular, the testing culture has influenced the contextual aspect of living out my philosophy. We shifted from learning to achievement and from observable evidence to measurable data. Critical thinking is often easy to observe and difficult to measure. While the nations that are beating us (Finland and Singapore, for example) utilize a critical thinking, constructivist, conceptual approach, we regressed into a hyper-industrial behaviorist pedagogy.
Put more simply, the context of school is often at war with my own philosophy of education. This might come as a shock, but I didn't become a teacher to help kids pass tests (not that I am opposed to kids passing tests). I became a teacher because I believe there is something empowering and transformative in critical thinking.