Effective is as relative as practical and usable. When I say "effective", I mean it as achieving the goal of anything but precision.I'm not sure about the use of "effective" because to Ti, something is most effective if it's accurate to begin with, and to Te, something is most effective if it is practical and usable.
Functions are pretty much black and white. How they are manifested isn't.(I didn't want to use fuzzy words like 'tendency' because I think no one accepts any of this theorising to be black and white anyway...at least, I hope not)..