It's very difficult engineering things for transients, as the outcome is destructive - something fails and everybody scratches their heads and guesses what went wrong. It's like an airplane crash.
A Teseq is very expensive. $30K and even more for calibration and upkeep, another $6k for the H/W and F/W upgrades. For something rarely used and seen as a small regulatory hurdle, management doesn't want to put any money into it. Consider selling your transient generator
You do a run and after the explosion, there is no high speed camera footage as to where the breakdown started.
It is quite a clown car for the junior engineers, who are terrified of using the transient generator and later stunned that they have no data or equation to reconsider.
Months go by and the product is late to market, pressure is on. The product has no budget dollars or room for bigger parts and clearances. I could go on and on.
It's mostly a problem of engineers not understanding the safety standards, the high costs with consulting UL/CSA over $400/hr, and the high costs of the test equipment, all to meet a few paragraphs in a safety standard- as the boss sees it.