Man, ain't that the truth, lol. I can't get up any rocks if there's not enough rear traction. Things that stock 4x4s climb right up stop my modified 4x2. That's a good part of the reason for the conversion.
Yeah I personally love playing offroad in my 2wd. I go mudding and trail running quite often. I welded the rear temporarily til I drop in an 8.8 and it made a HUGE difference in the performance offroad. Honestly my truck has been through more places off road than 90% of the 4x4 trucks that go with us.
But like what was said before. Always go with a 4x4 friend :) You never know what will happen. A whole you went through one day you might not make it through the next..