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The main issue with TestStand is it tries to be all things to all people. It's pitched as a test sequence engine but is too complicated and cumbersome for that. The main UI is far too complicated for production and the "screen" hooks are awkward and difficult to implement. Reports seem like an afterthought and the LabVIEW hooks are prone to crashing. If you thought global variables were bad, well we have have several different varieties with different scopes and figuring out where things are defined or coming from is a very deep rabbit hole. I greatly simplified my life when using Test Stand by having a single VI TCPIP connector that just emits an API string which you define in the test stand editor and running a service VI that receives the string and invokes the actual tests-basically reducing test stand to a command/response recipe script to order tests, retrieve results and throw up a big PASS/FAIL at the end. At that point it really doesn't matter what generates the API strings - test stand or a custom sequencer.