Glad you're here SilasValera! 🙂
An ESD chip is always a good idea. If you're designing something that needs to be rock solid during use, especially if you're changing out a removable SIM, even more of a good idea.
Overall, it depends on your level of comfort and how often you see yourself switching out the SIM. Also take in to account your operating environment. Is it going to be dry and prone to static discharge? Another vote for some type of ESD protection for a removable SIM.
Hope that helps with your decision!