Nee how, Wee Mei,
A heel fillet is certainly a good thing to have. From a reliability
perspective, whether you need it or not, depends on the operational conditions, the
delta-CTE between the package and the PCB, and the compliance of the leads.
Whether they survive your ESS depends on what your ESS consists of. Applying
adhesive over the solder joints does not help--underfill may.
Werner
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