rack n pinion front steer ackerman issues...explain...

Why is there so much hoopla about improper ackerman angle and dangerous handling if one wants to put a rack on an abody? Is it not just as simple as making new ends to face forward to attach the rack to the spindles? Why does everyone jump and say its dangerous but never explains why it is or you cant so it. You have to buy a 4000 dollar k member etc... one even said that the stock spindles would be "shorter" if front steer. I dont know how they shrink personally. if i didnt use my shrink ray but that is the going rate of return for switching to a rack n pinion.
So. I have been trying to find why the fear and misguided misdirection to guide one away from going to a rack n pinion is so previlant? Can anyone with experience and most important knowledge on this matter be of some help here?
I am currently having a custom tubular kmember made. It will include a front manual steering rack n pinion with the use of stock spindles and tubular arms single lower control arms and coilovers for drag racing with street driving use. Not a corner carver. With all the stories i heard it truly scared the crap out of me. I am no steering expert but i am a very fast study on things and i learned quickly. What they talked about was absolutely mind boggling.

Thought if we got enough solid great information on the matter. A sticky could be useful for future people who dont have thousands to buy a fancy kit like hdk etc..