What's the Deal with these Underdriven SSt-50s?

So, as I've heard it, the SST-50 P60 dropins aren't hittin' it, at least not as of yet--this being due to the silly limitation to 4.2 max volts. Having experimented with my friend's Triton M31 which runs on 8.4 volts, I can see the difference in output.

So why are these dropin modules so under-utilized? And is it possible to get one that runs up in the 18v top-off range like the single-mode XMLs that can work with RCR123s? This way, I could see paying extra for the purpose of modding my older Brinkmanns and other unused ones with SSt-50s.

Perhaps the heat buildup will kill them in minutes? 5A from normal grade li-ion 18650 isn't reasonable. It's a great emitter but personally SST-50 in a p60 dropin doesent make sense after XM-L's are available.

My problem is, why sell a compromised emitter that can't handle what it's supposed to do? If the drop-in exists, it should be able to be put in a body and driven up to 12 volts. You'd notice the brightness difference from the higher voltage, I'm thinking.

"My problem is, why sell a compromised emitter that can't handle what it's supposed to do?"

Well it was made probably before XM-L went on rampage. Afterall all those SST-50 must go somewhere. To my book if not driven beyond 3,5A are not even worth considering. I have experience with SST-50 and when driven conservatively well get's beaten hard by XM-L in perhaps all scenarios except current draw per lumen. (SST-50 being hungrier which is undesired) :)