TestStand has its place. Yes, it can be a very powerful tool, but where I work, TestStand was someone's hammer and every test solution was a nail. We have several instances where TestStand was grossly overkill, where a more lightweight test executive would have been a better fit.
I could write a short novel on all the hassle we've had with our TestStand based testers and the poor planning, development and implementation of it where I work, but I will refrain. (In fact, I did, but deleted it as it went on a long rant).
I'll just simply say that I've inherited those @%$#@ machines and they've been nothing but a 4-year headache and I'm slowly replacing each one with a LabVIEW-Only solution. The ones I've done so far perform much better/faster/stronger, are more robust and the operators gripe much less about them if at all. In fact a "notoriously gripey" operator said that they "absolutely loved the new tester" after I had completely reworked it to eliminate TestStand.