"new" means NEVER EVER tested now-a-days, not "it was tested and it works", unless it was a Motorcraft coil, they are tested
Ignition coils and spark modules run HOT, that's just part of doing a spark system
So they are higher failure rate parts
Newer designed coils are way better than the older designed ones but if new they are more likely to fail, sooner than later, but usually under warranty
The TFI module shouldn't Ground the Coil "-" with key on, that would cause it to heat up more, and could lead to early failure, you can test for that
The TFI should start grounding the coil only when distributor sensor starts to pulse