If the company is growing and in the “lottery ticket zone,” there is no chance a refresher grant should be a meaningful change to your potential outcome (for example: 20% more equity over 2 years is not worth the opportunity cost of getting 2 years of equity at another company).
If the company is growing so slowly that you could get a meaningful refresher grant, then you should move to another company that is growing faster.
If the company is growing so slowly that you could get a meaningful refresher grant, then you should move to another company that is growing faster.