@Shadow36 you dont need to change to eSIM if you don't need to
eSIM is something inside your phone to replace physical sim card. Some new phone are eSIM only and no longer have the slot for a physical sim card. It is convenient as you don't need to go out and buy a physical sim card if you want to activate quickly
On the other hand, with physical sim card, you can easily move it to another phone to test or when you have a new phone. With eSIM, you have to pay for a new eSIM each time you want to move to another phone or even if you have wiped the phone
