If you make CFLM touch it, it will turn blue and deactivate, and cause the VIBR to reset itself instead of exploding at the end. Just try and keep CFLM always touching it I guess? :P. This is something I added after the original VIBR since it really was too hard to use (if even possible to use at all). Also people started creating much more energy than I ever expected and can activate the VIBR pretty much right away.

It also releases a ton of heat that it absorbed at the end, and sparks but the sparks aren't too useful when everything melts (but some conductors never melt).

That's not the only reason, it was also added to absorb energy, and to explode. You can find the suggestion thread here: https://powdertoy.co.uk/Discussions/Thread/View.html?Thread=14723

And yes, it does absorb energy and release it as heat while exploding, but there really isn't much you can do in tpt to "give out" energy besides heat and sparks like it already does. A ton of reactions create heat already.