At the risk of sounding stupid - why do we work out how often villain is folding? For example, I have just been playing around with ranges for a specific villain. I know he folds his steal to a 3b 88% of the time. I managed to work out villain's range to match this number.

For context;

Villain is 18/16 w/ 8% 3B. ATS is 30% from LP, he folds his steal to a 3B 88% of the time.

I worked villain's range out to be the following;

Stealing range; 22-AA(78), Axs(48), Axo/s(192), KTo+(48)

QTo+(32), JTo(16), KTs+(12), QTs+(8), JTs(4), T9s(4), 98s(4), 87s(4), T9o(16)

= 466

Folding Range - 22-99(48), A2s-AJs(40), A2o-AJo(160), KTo+(48), QTo+(32), JTo(16)

KTs-KQs(12), QTs-QJs(8), JTs(4), T9s(4), 98s(4), 87s(4), T9o(16), 98o(16)

412/466 = 88%

Now how do I apply this? Why have I gone through the effort of working out villain's range?