(Treadwell: I had the same questions when I first started playing with seals, so no offense taken.)
The real wax is a bit flexible, but it can crack in half if it's handled roughly. (I'm sure the ye old stuff had the same problem.) The glue and the faux wax are super flexible so they completely survive.
Sealing wax is of a different consistency than candle wax -- I've often toyed with using crayons. It's definitely not going to melt easily. Problem is, without something like a glue gun, the wax has a tendency to scorch or worse, with the candle stick wax (sealing wax sticks with wick in the center of them) the wick will sometimes drop into the seal. When I first started doing seals I used the traditional wax and had about 1 in 5 seals fail to look good. With glue gun wax I have almost 100% success.
I recently had to seal 150 wedding invites and used the glue gun wax for it. The faux wax cools faster too, so you don't have to lay it on the ice pack. It really made it a breeze. My only complaint is that because of its flexibility it's often better to open the sealed letter using a letter opener rather than breaking the seal.
Another fun trick (if you are using the already colored faux wax) is to open the envelope and lay the flap on the parchment and seal on just the triangular flap (with the rest of the wax / glue being on the parchment). I do my Howler this way, and you can open and close the envelope without destroying the flap.