Funnily enough I was just asking about this, was thinking of doing a live planted tank for my future PTS, but I've instead chosen to put in potted plants (in ceramic pots) inside the tank, as they like to dig, and would probably disrupt the roots.
There's many pro's and cons, but I think it mostly depends on the species you plan to keep with live plants. Some may just destroy them, other species like geckos I think would work best with a planted tank as there isn't too much damage they could do.
I do make normal Terrariums with just the plants alone in either a sealed or open top glass bowl or vase of sorts, and some plant species do amazingly in that situation, such as some ferns/tropical plants. That being said they most defiantly attract insects, mostly flying ones. But overall, they aren't too hard to care for, they don't need too much water, and could really add that extra feature to an enclosure.
I think with the added element of an animal being there, particularly a large one, it could be very difficult to maintain both the plants needs and the reptiles needs, so finding plants that much the humidity or substrate type as reptiles is crucial.