Well can you imagine two sentences with olacaktım and olurdum,and that they have the same meaning? 
I´ll try to find some sentences later..

Counterfactual situations differ from hypotheticals in that the condition upon which they depend is known to be unrealizable, they are expressed by Ardı /MazdI or [y]acaktı

terk etmezdim --> terk et [verb stem] + mez [neg.aor.] + di [past] + m [1sg]

I wouldnt have left

dokunmazdım --> I wouldnt have touched

[ O konsere gitmek ] hoş olurdu / olacaktı

it would have been nice to go to that concert.

hoş ol [verb stem] + ur [AOR] + du [past]

hoş ol [verb stem] +acak [FUT] +tı [past]

Təşəkkür edirəm-Teşekkür ederim. Thank´s for your detail explanation,as always,they are helpful . 

Isn´t it exciting  -  I just noticed  -  that the same -ArdI/mAzdI form also expresses a habitual action in the past.

Turgut, sıkıntılı olduğu zamanlar sorulara cevap vermez, bu kartlardan birini uzatırdı. ´In boring moments Turgut used not to answer the questions and take one of these cards.´

And what is even more exciting is that as far as I know one could use the English would for the same purpose also!

´...Turgut would not answer the questions and take one of these cards."