First of all welcome to WD family!
WD is a famous company to do things efficiently including cost down everything unnecessary.
So in the future don't be surprise that your Legacy SaNDisk benefit will reduce along with layoff occurs every year.
Avg salary for SanDisk engineers are about 10~15% higher than legacy WD so your annual salary adjustment might be frozen for years in the future to allow time for salary of legacy WD engineers catching up .
Legacy HGST has already sensed such cost-down policy very well from integration with WD months ago.
So good luck guys and welcome to the family!