I had this in one kitchen that showed no problems in seven years and the kitchen and bathrooms in the house I grew up in had this and show no problems after 44 years.

Best if edge of counter to wall is sealed with silicone before backsplash is installed, be neat and keep it only on the edge of the counter and substrate- use tape to keep it off the wall above counter. Do that so that when you apply caulk it will stick.

when tile goes in use a grout that matches the caulk- buy it when you get the grout- and leave no less than 3/16" in for the caulk.