CVs break, Idler arm wears fast and/or bends, probably some other stuff I can't think of. To go 35s you need a suspension lift and a BL. Cranking tbars ain't going to do it. That means lots of money which could be better spent on a SAS.
A lot of the hardcore guys say in hindsight they should have never wasted money on an IFS lift, they should have gone SAS. So what a lot of us mediumcore guys do is do the minimal lift for 33s, lock the front and rear and get a crawler. We know that eventually we'd SAS. If you never plan on going SAS, then a IFS lift would be fine for you. But I can guarantee you that in almost any condition a locked truck with 32s will be more capable than an open diff'd truck with 35s.
The biggest factors in breaking CVs are tire size, how much you use the throttle and whether you're locked in the front. If you're easy on your truck then your CVs should last a while. Most people don't break CVs with an open diff, but it does happen. Of course, with an open diff, you're not as capable.
