@Ikeameatballlunch yes, it's unendingly complex. Endocrinology seems so complicated I think there must be a lot of guesswork! Nice algorithms just don't work because there are so many exceptions.
I had various tests including one with the TSH, fT3 and fT4 done mid afternoon after having taken my Levothyroxine in the morning. TSH came out around 1.2, fT4 mid range and fT3 way below the range. My fT3 had been below the range in two previous tests done at different times of day too when the TSH was also around 1-2 and fT4 mid range. Endocrinologist put me on Liothyronine in addition to Levothyroxine.
'Suppressed' TSH could (in some people, probably not many) be an incorrect label for the pituitary not producing it as opposed to it being from too much thyroid replacement hormone.
I agree with you about my own body though, I want my TSH in the low to middle part of the normal range, so roughly 0.4- 2 ish. If my pituitary feels in the mood to produce it that is. It has form for doing weird things such as deciding it doesn't feel like making any ACTH at all and I 'failed' the short synacthen test too (which I realise is the pituitary's other friend apart from the thyroid: the adrenals).
I wonder what the forums you mentioned would make of my results, because obviously it wasn't from a suppressed TSH or too much T4. I like to keep my endocrinologist busy; luckily, he's a really nice doctor.