Using "if" statements to designate movement limits

Hello peeps!

I'm trying to make an object wobble - that is, continuously move up and down inside a given range. I could achieve that with a loop, but I wanted to see if I could use "if" and the fact that "update" is effectively a loop already. Here's what I did:

     void Update()
     {
         wobble();  
     }
 
     void wobble()
     {  
         if (transform.position.y == wobbleHighLim)
         {
             wobbleSpeed = wobbleSpeed * -1;
             print (wobbleSpeed);
         }
         if (transform.position.y == wobbleLowLim)
         {
             wobbleSpeed = wobbleSpeed * -1;
             print (wobbleSpeed);
         }
         transform.Translate(Vector3.up * wobbleSpeed * Time.deltaTime, Space.World);
     }

I positioned the object inside the range and hit play. It started going up and never stopped, no message in the console either. However, when I changed the conditions from "if (transform.position.y == wobbleHighLim)" to "if (transform.position.y >= wobbleHighLim)" (and the same for wobbleLowLim), everything worked. Could someone please explain why that happened and what's the difference?