It is not true. There are special lenses for irregular shaped cornea. It cost more than those off-the-shelf ones.
What i would suggest is to understand your cornea thickness. Strictly speaking, i've done 3 times of lasik. Once 8 year back and twice last year uponwhich the last one was an enhancement. Even with that, my cornea thickness is still thickn enough (i think it read like 0.6 or something, check with your doc what is considered thick cornea for lasik).
Problem for cataract? I dont think there is any shaving of cornea for cataract lens placement, so what problem do you mean?
Of course, lasik is a form of operation and it carries a certain risk. Myopia will regress if you dont take care your eyes after the op. But seriously, all my friends and family who did it think this is the best decision we've ever made.
I guess you guys don't know that once eyes have been through lasik, can't wear contact lens anymore especially when there is a regress. Also, when time to do cataract op, there would be problems too? Check with your doc on all these inherent problems before you consider doing lasik.