Loathe is a bad word choice. It should say unpreferred. The concept is that you don't develop Te separate from Ti or vice versa, but you develop the thinking function as a whole. The person can utilize Ti or Te just as effectively as the other, it's just you trust one more than the other. This is harder to illustrate with judging functions, but with perceiving functions, it's highly noticeable. To an Ni user, doing things that require Ne will be easy, but it will seem very chaotic, unfocused, and inefficient. To an Ne user, unconscious visions presented by Ni will seem to come out of nowhere and be too in-depth; the Ne user thinks that the unconscious vision from Ni is highly unreliable and doesn't account for everything (when it can) because it seems to have come out of nowhere. The same applies with Te and Ti, except Te is the embodiment of pragmatism while Ti is the embodiment of understanding. Te wants to finish something as quickly as possible and make changes in the external environment. Ti wants to pile-drive a concept into the ground with incredible depth and understand everything about it. To a Te user, Ti will seem very subjective and highly inefficient. To a Ti user, Te will seem very structured and broad, not honing in on any particularities or understandings.