Do Soft Termination Caps Really Increase Reliability?
The more you use component the less you have reliability but some times it is not so. Normal MLCC capacitors are vulnerable against tensions due to assembly process and after that especially during lead free process that is much hotter.

soft termination caps are really more reliable but they are not the first choice for mass production even in safety critical applications.
In mass production the solution is using two serial normal MLCC capacitors those are assembled perpendicular to each other in the PCB. If one of them became short circuit due to tensions in one direction, the other could do part of the job obviously not as good as a single 0603 capacitor but more reliable than that and also more cheap than soft termination capacitors those are also hard to purchase from the market.